Merge commit from fork

* fix: Improve host header handling and deployment mode detection

* ZITADEL_CLOUD env

* refactor service config

* service config

* cleanup

* cleanup

* util for original and public host

* instanceHost, publicHost

* cleanup constructUrl

* cleanup middleware

* add x-zitadel-forward-host as fallback for current cloud setup

* fix build

* fix: lint

* fix: update test mocks

* fix: provide basepath to unit tests

* host handling

* unit tests

* imports

* fix: getPublicHost instead of getInstanceHost

* unit tests

* update nextjs, implement jwt verify for logout_token

* pass logout information in jwt to login v2

* handle hosts in jwks url

* point idp callbacks to the api and not the login UI

* logout_hint out of logout token, typecheck

* rm unused imports

* fix oidc integration test

---------

Co-authored-by: Livio Spring <[email protected]>

apps/login/next-env.d.ts

@@ -1,5 +1,6 @@
 /// <reference types="next" />
 /// <reference types="next/image-types/global" />
+/// <reference path="./.next/types/routes.d.ts" />
 
 // NOTE: This file should not be edited
 // see https://nextjs.org/docs/app/api-reference/config/typescript for more information.

apps/login/next.config.mjs

@@ -37,12 +37,9 @@ const nextConfig = {
   output: process.env.NEXT_OUTPUT_MODE || undefined,
   reactStrictMode: true,
   experimental: {
-    dynamicIO: true,
     // Add React 19 compatibility optimizations
     optimizePackageImports: ['@radix-ui/react-tooltip', '@heroicons/react'],
-  },
+    useCache: true,
-  eslint: {
-    ignoreDuringBuilds: true,
   },
   // Improve SSR stability - not actually needed for React 19 SSR issues
   // onDemandEntries: {

apps/login/package.json

@@ -36,7 +36,7 @@
     "deepmerge": "^4.3.1",
     "lucide-react": "0.469.0",
     "moment": "^2.29.4",
-    "next": "15.4.0-canary.86",
+    "next": "15.5.7",
     "next-intl": "^3.25.1",
     "next-themes": "^0.2.1",
     "nice-grpc": "2.0.1",
@@ -75,7 +75,7 @@
     "dotenv-cli": "^8.0.0",
     "env-cmd": "^10.1.0",
     "eslint": "^8.57.0",
-    "eslint-config-next": "15.4.0-canary.86",
+    "eslint-config-next": "15.5.7",
     "eslint-config-prettier": "^9.1.0",
     "gaxios": "^7.1.0",
     "grpc-tools": "1.13.0",

apps/login/src/app/(login)/accounts/page.tsx

@@ -2,8 +2,8 @@ import { DynamicTheme } from "@/components/dynamic-theme";
 import { SessionsList } from "@/components/sessions-list";
 import { Translated } from "@/components/translated";
 import { getAllSessionCookieIds } from "@/lib/cookies";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
-import { getBrandingSettings, getDefaultOrg, listSessions } from "@/lib/zitadel";
+import { getBrandingSettings, getDefaultOrg, listSessions, ServiceConfig } from "@/lib/zitadel";
 import { UserPlusIcon } from "@heroicons/react/24/outline";
 import { Organization } from "@zitadel/proto/zitadel/org/v2/org_pb";
 import { Metadata } from "next";
@@ -17,13 +17,11 @@ export async function generateMetadata(): Promise<Metadata> {
   return { title: t("title") };
 }
 
-async function loadSessions({ serviceUrl }: { serviceUrl: string }) {
+async function loadSessions({ serviceConfig }: { serviceConfig: ServiceConfig }) {
   const cookieIds = await getAllSessionCookieIds();
 
   if (cookieIds && cookieIds.length) {
-    const response = await listSessions({
+    const response = await listSessions({ serviceConfig, ids: cookieIds.filter((id) => !!id) as string[],
-      serviceUrl,
-      ids: cookieIds.filter((id) => !!id) as string[],
     });
     return response?.sessions ?? [];
   } else {
@@ -39,23 +37,19 @@ export default async function Page(props: { searchParams: Promise<Record<string
   const organization = searchParams?.organization;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   let defaultOrganization;
   if (!organization) {
-    const org: Organization | null = await getDefaultOrg({
+    const org: Organization | null = await getDefaultOrg({ serviceConfig, });
-      serviceUrl,
-    });
     if (org) {
       defaultOrganization = org.id;
     }
   }
 
-  let sessions = await loadSessions({ serviceUrl });
+  let sessions = await loadSessions({ serviceConfig });
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization: organization ?? defaultOrganization,
-    serviceUrl,
-    organization: organization ?? defaultOrganization,
   });
 
   const params = new URLSearchParams();

apps/login/src/app/(login)/authenticator/set/page.tsx

@@ -6,7 +6,7 @@ import { SignInWithIdp } from "@/components/sign-in-with-idp";
 import { Translated } from "@/components/translated";
 import { UserAvatar } from "@/components/user-avatar";
 import { getSessionCookieById } from "@/lib/cookies";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { loadMostRecentSession } from "@/lib/session";
 import { checkUserVerification } from "@/lib/verify-helper";
 import {
@@ -35,7 +35,7 @@ export default async function Page(props: { searchParams: Promise<Record<string
   const { loginName, requestId, organization, sessionId } = searchParams;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   const sessionWithData = sessionId
     ? await loadSessionById(sessionId, organization)
@@ -52,11 +52,9 @@ export default async function Page(props: { searchParams: Promise<Record<string
       throw Error("Could not get user id from session");
     }
 
-    return listAuthenticationMethodTypes({
+    return listAuthenticationMethodTypes({ serviceConfig, userId,
-      serviceUrl,
-      userId,
     }).then((methods) => {
-      return getUserByID({ serviceUrl, userId }).then((user) => {
+      return getUserByID({ serviceConfig, userId }).then((user) => {
         const humanUser = user.user?.type.case === "human" ? user.user?.type.value : undefined;
 
         return {
@@ -71,25 +69,21 @@ export default async function Page(props: { searchParams: Promise<Record<string
   }
 
   async function loadSessionByLoginname(loginName?: string, organization?: string) {
-    return loadMostRecentSession({
+    return loadMostRecentSession({ serviceConfig, sessionParams: {
-      serviceUrl,
-      sessionParams: {
         loginName,
         organization,
       },
     }).then((session) => {
-      return getAuthMethodsAndUser(serviceUrl, session);
+      return getAuthMethodsAndUser(serviceConfig.baseUrl, session);
     });
   }
 
   async function loadSessionById(sessionId: string, organization?: string) {
     const recent = await getSessionCookieById({ sessionId, organization });
-    return getSession({
+    return getSession({ serviceConfig, sessionId: recent.id,
-      serviceUrl,
-      sessionId: recent.id,
       sessionToken: recent.token,
     }).then((sessionResponse) => {
-      return getAuthMethodsAndUser(serviceUrl, sessionResponse.session);
+      return getAuthMethodsAndUser(serviceConfig.baseUrl, sessionResponse.session);
     });
   }
 
@@ -101,14 +95,10 @@ export default async function Page(props: { searchParams: Promise<Record<string
     );
   }
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization: sessionWithData.factors.user?.organizationId,
-    serviceUrl,
-    organization: sessionWithData.factors.user?.organizationId,
   });
 
-  const loginSettings = await getLoginSettings({
+  const loginSettings = await getLoginSettings({ serviceConfig, organization: sessionWithData.factors.user?.organizationId,
-    serviceUrl,
-    organization: sessionWithData.factors.user?.organizationId,
   });
 
   // check if user was verified recently
@@ -132,9 +122,7 @@ export default async function Page(props: { searchParams: Promise<Record<string
     redirect(`/verify?` + params);
   }
 
-  const identityProviders = await getActiveIdentityProviders({
+  const identityProviders = await getActiveIdentityProviders({ serviceConfig, orgId: sessionWithData.factors?.user?.organizationId,
-    serviceUrl,
-    orgId: sessionWithData.factors?.user?.organizationId,
     linking_allowed: true,
   }).then((resp) => {
     return resp.identityProviders;

apps/login/src/app/(login)/device/consent/page.tsx

@@ -1,7 +1,7 @@
 import { ConsentScreen } from "@/components/consent";
 import { DynamicTheme } from "@/components/dynamic-theme";
 import { Translated } from "@/components/translated";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { getBrandingSettings, getDefaultOrg, getDeviceAuthorizationRequest } from "@/lib/zitadel";
 import { Organization } from "@zitadel/proto/zitadel/org/v2/org_pb";
 import { headers } from "next/headers";
@@ -22,11 +22,9 @@ export default async function Page(props: { searchParams: Promise<Record<string
   }
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
-  const { deviceAuthorizationRequest } = await getDeviceAuthorizationRequest({
+  const { deviceAuthorizationRequest } = await getDeviceAuthorizationRequest({ serviceConfig, userCode,
-    serviceUrl,
-    userCode,
   });
 
   if (!deviceAuthorizationRequest) {
@@ -39,17 +37,13 @@ export default async function Page(props: { searchParams: Promise<Record<string
 
   let defaultOrganization;
   if (!organization) {
-    const org: Organization | null = await getDefaultOrg({
+    const org: Organization | null = await getDefaultOrg({ serviceConfig, });
-      serviceUrl,
-    });
     if (org) {
       defaultOrganization = org.id;
     }
   }
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization: organization ?? defaultOrganization,
-    serviceUrl,
-    organization: organization ?? defaultOrganization,
   });
 
   const params = new URLSearchParams();

apps/login/src/app/(login)/device/page.tsx

@@ -1,7 +1,7 @@
 import { DeviceCodeForm } from "@/components/device-code-form";
 import { DynamicTheme } from "@/components/dynamic-theme";
 import { Translated } from "@/components/translated";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { getBrandingSettings, getDefaultOrg } from "@/lib/zitadel";
 import { Organization } from "@zitadel/proto/zitadel/org/v2/org_pb";
 import { Metadata } from "next";
@@ -20,21 +20,17 @@ export default async function Page(props: { searchParams: Promise<Record<string
   const organization = searchParams?.organization;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   let defaultOrganization;
   if (!organization) {
-    const org: Organization | null = await getDefaultOrg({
+    const org: Organization | null = await getDefaultOrg({ serviceConfig, });
-      serviceUrl,
-    });
     if (org) {
       defaultOrganization = org.id;
     }
   }
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization: organization ?? defaultOrganization,
-    serviceUrl,
-    organization: organization ?? defaultOrganization,
   });
 
   return (

apps/login/src/app/(login)/idp/[provider]/account-not-found/page.tsx

@@ -2,7 +2,7 @@ import { Alert, AlertType } from "@/components/alert";
 import { Button } from "@/components/button";
 import { DynamicTheme } from "@/components/dynamic-theme";
 import { Translated } from "@/components/translated";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { getBrandingSettings, getDefaultOrg } from "@/lib/zitadel";
 import { Organization } from "@zitadel/proto/zitadel/org/v2/org_pb";
 import { Metadata } from "next";
@@ -20,21 +20,17 @@ export default async function Page(props: { searchParams: Promise<Record<string
   const { organization, postErrorRedirectUrl } = searchParams;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   let defaultOrganization;
   if (!organization) {
-    const org: Organization | null = await getDefaultOrg({
+    const org: Organization | null = await getDefaultOrg({ serviceConfig, });
-      serviceUrl,
-    });
     if (org) {
       defaultOrganization = org.id;
     }
   }
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization: organization ?? defaultOrganization,
-    serviceUrl,
-    organization: organization ?? defaultOrganization,
   });
 
   return (

apps/login/src/app/(login)/idp/[provider]/complete-registration/page.tsx

@@ -1,7 +1,7 @@
 import { DynamicTheme } from "@/components/dynamic-theme";
 import { RegisterFormIDPIncomplete } from "@/components/register-form-idp-incomplete";
 import { Translated } from "@/components/translated";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { getBrandingSettings } from "@/lib/zitadel";
 import { headers } from "next/headers";
 
@@ -16,11 +16,9 @@ export default async function CompleteRegistrationPage(props: {
   const { id, token, requestId, organization, idpId, idpUserId, idpUserName, givenName, familyName, email } = searchParams;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
   if (!id || !token || !idpId || !organization || !idpUserId || !idpUserName) {

apps/login/src/app/(login)/idp/[provider]/failure/page.tsx

@@ -3,7 +3,7 @@ import { ChooseAuthenticatorToLogin } from "@/components/choose-authenticator-to
 import { DynamicTheme } from "@/components/dynamic-theme";
 import { Translated } from "@/components/translated";
 import { UserAvatar } from "@/components/user-avatar";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { getBrandingSettings, getLoginSettings, getUserByID, listAuthenticationMethodTypes } from "@/lib/zitadel";
 import { HumanUser, User } from "@zitadel/proto/zitadel/user/v2/user_pb";
 import { AuthenticationMethodType } from "@zitadel/proto/zitadel/user/v2/user_service_pb";
@@ -18,16 +18,12 @@ export default async function Page(props: {
   const { organization, userId } = searchParams;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
-  const loginSettings = await getLoginSettings({
+  const loginSettings = await getLoginSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
   let authMethods: AuthenticationMethodType[] = [];
@@ -43,9 +39,7 @@ export default async function Page(props: {
   }
 
   if (userId) {
-    const userResponse = await getUserByID({
+    const userResponse = await getUserByID({ serviceConfig, userId,
-      serviceUrl,
-      userId,
     });
     if (userResponse) {
       user = userResponse.user;
@@ -58,9 +52,7 @@ export default async function Page(props: {
       }
     }
 
-    const authMethodsResponse = await listAuthenticationMethodTypes({
+    const authMethodsResponse = await listAuthenticationMethodTypes({ serviceConfig, userId,
-      serviceUrl,
-      userId,
     });
     if (authMethodsResponse.authMethodTypes) {
       authMethods = authMethodsResponse.authMethodTypes;

apps/login/src/app/(login)/idp/[provider]/linking-failed/page.tsx

@@ -1,6 +1,6 @@
 import { DynamicTheme } from "@/components/dynamic-theme";
 import { Translated } from "@/components/translated";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { getBrandingSettings } from "@/lib/zitadel";
 import { headers } from "next/headers";
 
@@ -15,11 +15,9 @@ export default async function LinkingFailedPage(props: {
   const { organization, error } = searchParams;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
   return (

apps/login/src/app/(login)/idp/[provider]/registration-failed/page.tsx

@@ -2,7 +2,7 @@ import { Alert, AlertType } from "@/components/alert";
 import { Button } from "@/components/button";
 import { DynamicTheme } from "@/components/dynamic-theme";
 import { Translated } from "@/components/translated";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { getBrandingSettings, getDefaultOrg } from "@/lib/zitadel";
 import { Organization } from "@zitadel/proto/zitadel/org/v2/org_pb";
 import { Metadata } from "next";
@@ -20,21 +20,17 @@ export default async function Page(props: { searchParams: Promise<Record<string
   const { organization, postErrorRedirectUrl } = searchParams;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   let defaultOrganization;
   if (!organization) {
-    const org: Organization | null = await getDefaultOrg({
+    const org: Organization | null = await getDefaultOrg({ serviceConfig, });
-      serviceUrl,
-    });
     if (org) {
       defaultOrganization = org.id;
     }
   }
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization: organization ?? defaultOrganization,
-    serviceUrl,
-    organization: organization ?? defaultOrganization,
   });
 
   return (

apps/login/src/app/(login)/idp/ldap/page.tsx

@@ -1,7 +1,7 @@
 import { DynamicTheme } from "@/components/dynamic-theme";
 import { LDAPUsernamePasswordForm } from "@/components/ldap-username-password-form";
 import { Translated } from "@/components/translated";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { getBrandingSettings, getDefaultOrg } from "@/lib/zitadel";
 import { Organization } from "@zitadel/proto/zitadel/org/v2/org_pb";
 import { headers } from "next/headers";
@@ -18,21 +18,17 @@ export default async function Page(props: {
   }
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   let defaultOrganization;
   if (!organization) {
-    const org: Organization | null = await getDefaultOrg({
+    const org: Organization | null = await getDefaultOrg({ serviceConfig, });
-      serviceUrl,
-    });
     if (org) {
       defaultOrganization = org.id;
     }
   }
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization: organization ?? defaultOrganization,
-    serviceUrl,
-    organization: organization ?? defaultOrganization,
   });
 
   // return login failed if no linking or creation is allowed and no user was found

apps/login/src/app/(login)/idp/page.tsx

@@ -1,7 +1,7 @@
 import { DynamicTheme } from "@/components/dynamic-theme";
 import { SignInWithIdp } from "@/components/sign-in-with-idp";
 import { Translated } from "@/components/translated";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { getActiveIdentityProviders, getBrandingSettings } from "@/lib/zitadel";
 import { Metadata } from "next";
 import { getTranslations } from "next-intl/server";
@@ -19,18 +19,14 @@ export default async function Page(props: { searchParams: Promise<Record<string
   const organization = searchParams?.organization;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
-  const identityProviders = await getActiveIdentityProviders({
+  const identityProviders = await getActiveIdentityProviders({ serviceConfig, orgId: organization,
-    serviceUrl,
-    orgId: organization,
   }).then((resp) => {
     return resp.identityProviders;
   });
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
   return (

apps/login/src/app/(login)/loginname/page.tsx

@@ -2,7 +2,7 @@ import { DynamicTheme } from "@/components/dynamic-theme";
 import { SignInWithIdp } from "@/components/sign-in-with-idp";
 import { Translated } from "@/components/translated";
 import { UsernameForm } from "@/components/username-form";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { getActiveIdentityProviders, getBrandingSettings, getDefaultOrg, getLoginSettings } from "@/lib/zitadel";
 import { Organization } from "@zitadel/proto/zitadel/org/v2/org_pb";
 import { Metadata } from "next";
@@ -24,38 +24,28 @@ export default async function Page(props: { searchParams: Promise<Record<string
   const submit: boolean = searchParams?.submit === "true";
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   let defaultOrganization;
   if (!organization) {
-    const org: Organization | null = await getDefaultOrg({
+    const org: Organization | null = await getDefaultOrg({ serviceConfig, });
-      serviceUrl,
-    });
     if (org) {
       defaultOrganization = org.id;
     }
   }
 
-  const loginSettings = await getLoginSettings({
+  const loginSettings = await getLoginSettings({ serviceConfig, organization: organization ?? defaultOrganization,
-    serviceUrl,
-    organization: organization ?? defaultOrganization,
   });
 
-  const contextLoginSettings = await getLoginSettings({
+  const contextLoginSettings = await getLoginSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
-  const identityProviders = await getActiveIdentityProviders({
+  const identityProviders = await getActiveIdentityProviders({ serviceConfig, orgId: organization ?? defaultOrganization,
-    serviceUrl,
-    orgId: organization ?? defaultOrganization,
   }).then((resp) => {
     return resp.identityProviders;
   });
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization: organization ?? defaultOrganization,
-    serviceUrl,
-    organization: organization ?? defaultOrganization,
   });
 
   return (

apps/login/src/app/(login)/logout/done/page.tsx

@@ -1,6 +1,6 @@
 import { DynamicTheme } from "@/components/dynamic-theme";
 import { Translated } from "@/components/translated";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { getBrandingSettings } from "@/lib/zitadel";
 import { headers } from "next/headers";
 
@@ -8,13 +8,11 @@ export default async function Page(props: { searchParams: Promise<any> }) {
   const searchParams = await props.searchParams;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   const { organization } = searchParams;
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
   return (

apps/login/src/app/(login)/logout/page.tsx

@@ -2,8 +2,9 @@ import { DynamicTheme } from "@/components/dynamic-theme";
 import { SessionsClearList } from "@/components/sessions-clear-list";
 import { Translated } from "@/components/translated";
 import { getAllSessionCookieIds } from "@/lib/cookies";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
-import { getBrandingSettings, getDefaultOrg, listSessions } from "@/lib/zitadel";
+import { getBrandingSettings, getDefaultOrg, listSessions, ServiceConfig } from "@/lib/zitadel";
+import { verifyJwt } from "@zitadel/client/node";
 import { Organization } from "@zitadel/proto/zitadel/org/v2/org_pb";
 import { Metadata } from "next";
 import { getTranslations } from "next-intl/server";
@@ -11,17 +12,14 @@ import { headers } from "next/headers";
 
 export async function generateMetadata(): Promise<Metadata> {
   const t = await getTranslations("logout");
-  return { title: t('title')};
+  return { title: t("title") };
 }
 
-async function loadSessions({ serviceUrl }: { serviceUrl: string }) {
+async function loadSessions({ serviceConfig }: { serviceConfig: ServiceConfig }) {
   const cookieIds = await getAllSessionCookieIds();
 
   if (cookieIds && cookieIds.length) {
-    const response = await listSessions({
+    const response = await listSessions({ serviceConfig, ids: cookieIds.filter((id) => !!id) as string[] });
-      serviceUrl,
-      ids: cookieIds.filter((id) => !!id) as string[],
-    });
     return response?.sessions ?? [];
   } else {
     console.info("No session cookie found.");
@@ -33,30 +31,46 @@ export default async function Page(props: { searchParams: Promise<Record<string
   const searchParams = await props.searchParams;
 
   const organization = searchParams?.organization;
-  const postLogoutRedirectUri = searchParams?.post_logout_redirect || searchParams?.post_logout_redirect_uri;
+  const logoutToken = searchParams?.logout_token;
-  const logoutHint = searchParams?.logout_hint;
-  // TODO implement with new translation service
-  // const UILocales = searchParams?.ui_locales;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
+
+  let postLogoutRedirectUri, logoutHint;
+  if (logoutToken) {
+    try {
+      const payload = await verifyJwt<{ post_logout_redirect_uri?: string; logoutHint?: string }>(
+        logoutToken,
+        `${serviceConfig.baseUrl}/oauth/v2/keys`,
+        {
+          instanceHost: serviceConfig.instanceHost,
+          publicHost: serviceConfig.publicHost,
+        },
+      );
+      console.log("logout token payload", payload);
+
+      if (payload.post_logout_redirect_uri && typeof payload.post_logout_redirect_uri === "string") {
+        postLogoutRedirectUri = payload.post_logout_redirect_uri;
+      }
+      if (payload.logout_hint && typeof payload.logout_hint === "string") {
+        logoutHint = payload.logout_hint;
+      }
+    } catch (error) {
+      console.error("Failed to verify logout token", error);
+    }
+  }
 
   let defaultOrganization;
   if (!organization) {
-    const org: Organization | null = await getDefaultOrg({
+    const org: Organization | null = await getDefaultOrg({ serviceConfig });
-      serviceUrl,
-    });
     if (org) {
       defaultOrganization = org.id;
     }
   }
 
-  let sessions = await loadSessions({ serviceUrl });
+  let sessions = await loadSessions({ serviceConfig });
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization: organization ?? defaultOrganization });
-    serviceUrl,
-    organization: organization ?? defaultOrganization,
-  });
 
   const params = new URLSearchParams();
 

apps/login/src/app/(login)/mfa/page.tsx

@@ -5,7 +5,7 @@ import { DynamicTheme } from "@/components/dynamic-theme";
 import { Translated } from "@/components/translated";
 import { UserAvatar } from "@/components/user-avatar";
 import { getSessionCookieById } from "@/lib/cookies";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { loadMostRecentSession } from "@/lib/session";
 import { getBrandingSettings, getSession, listAuthenticationMethodTypes } from "@/lib/zitadel";
 import { Metadata } from "next";
@@ -23,24 +23,20 @@ export default async function Page(props: { searchParams: Promise<Record<string
   const { loginName, requestId, organization, sessionId } = searchParams;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   const sessionFactors = sessionId
-    ? await loadSessionById(serviceUrl, sessionId, organization)
+    ? await loadSessionById(serviceConfig.baseUrl, sessionId, organization)
-    : await loadSessionByLoginname(serviceUrl, loginName, organization);
+    : await loadSessionByLoginname(serviceConfig.baseUrl, loginName, organization);
 
   async function loadSessionByLoginname(serviceUrl: string, loginName?: string, organization?: string) {
-    return loadMostRecentSession({
+    return loadMostRecentSession({ serviceConfig, sessionParams: {
-      serviceUrl,
-      sessionParams: {
         loginName,
         organization,
       },
     }).then((session) => {
       if (session && session.factors?.user?.id) {
-        return listAuthenticationMethodTypes({
+        return listAuthenticationMethodTypes({ serviceConfig, userId: session.factors.user.id,
-          serviceUrl,
-          userId: session.factors.user.id,
         }).then((methods) => {
           return {
             factors: session?.factors,
@@ -53,15 +49,11 @@ export default async function Page(props: { searchParams: Promise<Record<string
 
   async function loadSessionById(host: string, sessionId: string, organization?: string) {
     const recent = await getSessionCookieById({ sessionId, organization });
-    return getSession({
+    return getSession({ serviceConfig, sessionId: recent.id,
-      serviceUrl,
-      sessionId: recent.id,
       sessionToken: recent.token,
     }).then((response) => {
       if (response?.session && response.session.factors?.user?.id) {
-        return listAuthenticationMethodTypes({
+        return listAuthenticationMethodTypes({ serviceConfig, userId: response.session.factors.user.id,
-          serviceUrl,
-          userId: response.session.factors.user.id,
         }).then((methods) => {
           return {
             factors: response.session?.factors,
@@ -72,9 +64,7 @@ export default async function Page(props: { searchParams: Promise<Record<string
     });
   }
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
   return (

apps/login/src/app/(login)/mfa/set/page.tsx

@@ -5,7 +5,7 @@ import { DynamicTheme } from "@/components/dynamic-theme";
 import { Translated } from "@/components/translated";
 import { UserAvatar } from "@/components/user-avatar";
 import { getSessionCookieById } from "@/lib/cookies";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { loadMostRecentSession } from "@/lib/session";
 import {
   getBrandingSettings,
@@ -46,7 +46,7 @@ export default async function Page(props: { searchParams: Promise<Record<string
   const { loginName, checkAfter, force, requestId, organization, sessionId } = searchParams;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   const sessionWithData = sessionId
     ? await loadSessionById(sessionId, organization)
@@ -59,11 +59,9 @@ export default async function Page(props: { searchParams: Promise<Record<string
       throw Error("Could not get user id from session");
     }
 
-    return listAuthenticationMethodTypes({
+    return listAuthenticationMethodTypes({ serviceConfig, userId,
-      serviceUrl,
-      userId,
     }).then((methods) => {
-      return getUserByID({ serviceUrl, userId }).then((user) => {
+      return getUserByID({ serviceConfig, userId }).then((user) => {
         const humanUser = user.user?.type.case === "human" ? user.user?.type.value : undefined;
 
         return {
@@ -79,9 +77,7 @@ export default async function Page(props: { searchParams: Promise<Record<string
   }
 
   async function loadSessionByLoginname(loginName?: string, organization?: string) {
-    return loadMostRecentSession({
+    return loadMostRecentSession({ serviceConfig, sessionParams: {
-      serviceUrl,
-      sessionParams: {
         loginName,
         organization,
       },
@@ -92,22 +88,16 @@ export default async function Page(props: { searchParams: Promise<Record<string
 
   async function loadSessionById(sessionId: string, organization?: string) {
     const recent = await getSessionCookieById({ sessionId, organization });
-    return getSession({
+    return getSession({ serviceConfig, sessionId: recent.id,
-      serviceUrl,
-      sessionId: recent.id,
       sessionToken: recent.token,
     }).then((sessionResponse) => {
       return getAuthMethodsAndUser(sessionResponse.session);
     });
   }
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
-  const loginSettings = await getLoginSettings({
+  const loginSettings = await getLoginSettings({ serviceConfig, organization: sessionWithData.factors?.user?.organizationId,
-    serviceUrl,
-    organization: sessionWithData.factors?.user?.organizationId,
   });
 
   const { valid } = isSessionValid(sessionWithData);

apps/login/src/app/(login)/otp/[method]/page.tsx

@@ -4,8 +4,8 @@ import { LoginOTP } from "@/components/login-otp";
 import { Translated } from "@/components/translated";
 import { UserAvatar } from "@/components/user-avatar";
 import { getSessionCookieById } from "@/lib/cookies";
-import { getOriginalHost } from "@/lib/server/host";
+import { getPublicHost } from "@/lib/server/host";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { loadMostRecentSession } from "@/lib/session";
 import { getBrandingSettings, getLoginSettings, getSession } from "@/lib/zitadel";
 import { Metadata } from "next";
@@ -25,8 +25,8 @@ export default async function Page(props: {
   const searchParams = await props.searchParams;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
-  const host = await getOriginalHost();
+  const host = getPublicHost(_headers);
 
   const {
     loginName, // send from password page
@@ -40,18 +40,11 @@ export default async function Page(props: {
 
   const session = sessionId
     ? await loadSessionById(sessionId, organization)
-    : await loadMostRecentSession({
+    : await loadMostRecentSession({ serviceConfig, sessionParams: { loginName, organization } });
-        serviceUrl,
-        sessionParams: { loginName, organization },
-      });
 
   async function loadSessionById(sessionId: string, organization?: string) {
     const recent = await getSessionCookieById({ sessionId, organization });
-    return getSession({
+    return getSession({ serviceConfig, sessionId: recent.id, sessionToken: recent.token }).then((response) => {
-      serviceUrl,
-      sessionId: recent.id,
-      sessionToken: recent.token,
-    }).then((response) => {
       if (response?.session) {
         return response.session;
       }
@@ -60,12 +53,12 @@ export default async function Page(props: {
 
   // email links do not come with organization, thus we need to use the session's organization
   const branding = await getBrandingSettings({
-    serviceUrl,
+    serviceConfig,
     organization: organization ?? session?.factors?.user?.organizationId,
   });
 
   const loginSettings = await getLoginSettings({
-    serviceUrl,
+    serviceConfig,
     organization: organization ?? session?.factors?.user?.organizationId,
   });
 

apps/login/src/app/(login)/otp/[method]/set/page.tsx

@@ -5,7 +5,7 @@ import { DynamicTheme } from "@/components/dynamic-theme";
 import { TotpRegister } from "@/components/totp-register";
 import { Translated } from "@/components/translated";
 import { UserAvatar } from "@/components/user-avatar";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { loadMostRecentSession } from "@/lib/session";
 import { addOTPEmail, addOTPSMS, getBrandingSettings, getLoginSettings, registerTOTP } from "@/lib/zitadel";
 import { RegisterTOTPResponse } from "@zitadel/proto/zitadel/user/v2/user_service_pb";
@@ -24,20 +24,14 @@ export default async function Page(props: {
   const { method } = params;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
-  const loginSettings = await getLoginSettings({
+  const loginSettings = await getLoginSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
-  const session = await loadMostRecentSession({
+  const session = await loadMostRecentSession({ serviceConfig, sessionParams: {
-    serviceUrl,
-    sessionParams: {
       loginName,
       organization,
     },
@@ -46,9 +40,7 @@ export default async function Page(props: {
   let totpResponse: RegisterTOTPResponse | undefined, error: Error | undefined;
   if (session && session.factors?.user?.id) {
     if (method === "time-based") {
-      await registerTOTP({
+      await registerTOTP({ serviceConfig, userId: session.factors.user.id,
-        serviceUrl,
-        userId: session.factors.user.id,
       })
         .then((resp) => {
           if (resp) {
@@ -59,17 +51,13 @@ export default async function Page(props: {
           error = err;
         });
     } else if (method === "sms") {
-      await addOTPSMS({
+      await addOTPSMS({ serviceConfig, userId: session.factors.user.id,
-        serviceUrl,
-        userId: session.factors.user.id,
       }).catch((_error) => {
         // TODO: Throw this error?
         new Error("Could not add OTP via SMS");
       });
     } else if (method === "email") {
-      await addOTPEmail({
+      await addOTPEmail({ serviceConfig, userId: session.factors.user.id,
-        serviceUrl,
-        userId: session.factors.user.id,
       }).catch((_error) => {
         // TODO: Throw this error?
         new Error("Could not add OTP via Email");

apps/login/src/app/(login)/passkey/page.tsx

@@ -4,7 +4,7 @@ import { LoginPasskey } from "@/components/login-passkey";
 import { Translated } from "@/components/translated";
 import { UserAvatar } from "@/components/user-avatar";
 import { getSessionCookieById } from "@/lib/cookies";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { loadMostRecentSession } from "@/lib/session";
 import { getBrandingSettings, getSession } from "@/lib/zitadel";
 import { Metadata } from "next";
@@ -22,20 +22,16 @@ export default async function Page(props: { searchParams: Promise<Record<string
   const { loginName, altPassword, requestId, organization, sessionId } = searchParams;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   const sessionFactors = sessionId
-    ? await loadSessionById(serviceUrl, sessionId, organization)
+    ? await loadSessionById(serviceConfig.baseUrl, sessionId, organization)
-    : await loadMostRecentSession({
+    : await loadMostRecentSession({ serviceConfig, sessionParams: { loginName, organization },
-        serviceUrl,
-        sessionParams: { loginName, organization },
       });
 
   async function loadSessionById(serviceUrl: string, sessionId: string, organization?: string) {
     const recent = await getSessionCookieById({ sessionId, organization });
-    return getSession({
+    return getSession({ serviceConfig, sessionId: recent.id,
-      serviceUrl,
-      sessionId: recent.id,
       sessionToken: recent.token,
     }).then((response) => {
       if (response?.session) {
@@ -44,9 +40,7 @@ export default async function Page(props: { searchParams: Promise<Record<string
     });
   }
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
   return (

apps/login/src/app/(login)/passkey/set/page.tsx

@@ -3,7 +3,7 @@ import { DynamicTheme } from "@/components/dynamic-theme";
 import { RegisterPasskey } from "@/components/register-passkey";
 import { Translated } from "@/components/translated";
 import { UserAvatar } from "@/components/user-avatar";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { loadMostRecentSession } from "@/lib/session";
 import { getBrandingSettings, getUserByID } from "@/lib/zitadel";
 import { Session } from "@zitadel/proto/zitadel/session/v2/session_pb";
@@ -23,31 +23,25 @@ export default async function Page(props: { searchParams: Promise<Record<string
   const { userId, loginName, prompt, organization, requestId, code, codeId } = searchParams;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   // also allow no session to be found for userId-based flows
   let session: Session | undefined;
   if (loginName) {
-    session = await loadMostRecentSession({
+    session = await loadMostRecentSession({ serviceConfig, sessionParams: {
-      serviceUrl,
-      sessionParams: {
         loginName,
         organization,
       },
     });
   }
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
   let user: User | undefined;
   let displayName: string | undefined;
   if (userId) {
-    const userResponse = await getUserByID({
+    const userResponse = await getUserByID({ serviceConfig, userId,
-      serviceUrl,
-      userId,
     });
     user = userResponse.user;
 

apps/login/src/app/(login)/password/change/page.tsx

@@ -3,7 +3,7 @@ import { ChangePasswordForm } from "@/components/change-password-form";
 import { DynamicTheme } from "@/components/dynamic-theme";
 import { Translated } from "@/components/translated";
 import { UserAvatar } from "@/components/user-avatar";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { loadMostRecentSession } from "@/lib/session";
 import { getBrandingSettings, getLoginSettings, getPasswordComplexitySettings } from "@/lib/zitadel";
 import { Metadata } from "next";
@@ -17,34 +17,26 @@ export async function generateMetadata(): Promise<Metadata> {
 
 export default async function Page(props: { searchParams: Promise<Record<string | number | symbol, string | undefined>> }) {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   const searchParams = await props.searchParams;
 
   const { loginName, organization, requestId } = searchParams;
 
   // also allow no session to be found (ignoreUnkownUsername)
-  const sessionFactors = await loadMostRecentSession({
+  const sessionFactors = await loadMostRecentSession({ serviceConfig, sessionParams: {
-    serviceUrl,
-    sessionParams: {
       loginName,
       organization,
     },
   });
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
-  const passwordComplexity = await getPasswordComplexitySettings({
+  const passwordComplexity = await getPasswordComplexitySettings({ serviceConfig, organization: sessionFactors?.factors?.user?.organizationId,
-    serviceUrl,
-    organization: sessionFactors?.factors?.user?.organizationId,
   });
 
-  const loginSettings = await getLoginSettings({
+  const loginSettings = await getLoginSettings({ serviceConfig, organization: sessionFactors?.factors?.user?.organizationId,
-    serviceUrl,
-    organization: sessionFactors?.factors?.user?.organizationId,
   });
 
   return (

apps/login/src/app/(login)/password/page.tsx

@@ -3,7 +3,7 @@ import { DynamicTheme } from "@/components/dynamic-theme";
 import { PasswordForm } from "@/components/password-form";
 import { Translated } from "@/components/translated";
 import { UserAvatar } from "@/components/user-avatar";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { loadMostRecentSession } from "@/lib/session";
 import { getBrandingSettings, getDefaultOrg, getLoginSettings } from "@/lib/zitadel";
 import { Organization } from "@zitadel/proto/zitadel/org/v2/org_pb";
@@ -21,13 +21,11 @@ export default async function Page(props: { searchParams: Promise<Record<string
   let { loginName, organization, requestId } = searchParams;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   let defaultOrganization;
   if (!organization) {
-    const org: Organization | null = await getDefaultOrg({
+    const org: Organization | null = await getDefaultOrg({ serviceConfig, });
-      serviceUrl,
-    });
 
     if (org) {
       defaultOrganization = org.id;
@@ -37,9 +35,7 @@ export default async function Page(props: { searchParams: Promise<Record<string
   // also allow no session to be found (ignoreUnkownUsername)
   let sessionFactors;
   try {
-    sessionFactors = await loadMostRecentSession({
+    sessionFactors = await loadMostRecentSession({ serviceConfig, sessionParams: {
-      serviceUrl,
-      sessionParams: {
         loginName,
         organization,
       },
@@ -49,13 +45,9 @@ export default async function Page(props: { searchParams: Promise<Record<string
     console.warn(error);
   }
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization: organization ?? defaultOrganization,
-    serviceUrl,
-    organization: organization ?? defaultOrganization,
   });
-  const loginSettings = await getLoginSettings({
+  const loginSettings = await getLoginSettings({ serviceConfig, organization: organization ?? defaultOrganization,
-    serviceUrl,
-    organization: organization ?? defaultOrganization,
   });
 
   return (

apps/login/src/app/(login)/password/set/page.tsx

@@ -3,7 +3,7 @@ import { DynamicTheme } from "@/components/dynamic-theme";
 import { SetPasswordForm } from "@/components/set-password-form";
 import { Translated } from "@/components/translated";
 import { UserAvatar } from "@/components/user-avatar";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { loadMostRecentSession } from "@/lib/session";
 import { getBrandingSettings, getLoginSettings, getPasswordComplexitySettings, getUserByID } from "@/lib/zitadel";
 import { Session } from "@zitadel/proto/zitadel/session/v2/session_pb";
@@ -23,41 +23,31 @@ export default async function Page(props: { searchParams: Promise<Record<string
   const { userId, loginName, organization, requestId, code, initial } = searchParams;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   // also allow no session to be found (ignoreUnkownUsername)
   let session: Session | undefined;
   if (loginName) {
-    session = await loadMostRecentSession({
+    session = await loadMostRecentSession({ serviceConfig, sessionParams: {
-      serviceUrl,
-      sessionParams: {
         loginName,
         organization,
       },
     });
   }
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
-  const passwordComplexity = await getPasswordComplexitySettings({
+  const passwordComplexity = await getPasswordComplexitySettings({ serviceConfig, organization: session?.factors?.user?.organizationId,
-    serviceUrl,
-    organization: session?.factors?.user?.organizationId,
   });
 
-  const loginSettings = await getLoginSettings({
+  const loginSettings = await getLoginSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
   let user: User | undefined;
   let displayName: string | undefined;
   if (userId) {
-    const userResponse = await getUserByID({
+    const userResponse = await getUserByID({ serviceConfig, userId,
-      serviceUrl,
-      userId,
     });
     user = userResponse.user;
 

apps/login/src/app/(login)/register/page.tsx

@@ -3,7 +3,7 @@ import { DynamicTheme } from "@/components/dynamic-theme";
 import { RegisterForm } from "@/components/register-form";
 import { SignInWithIdp } from "@/components/sign-in-with-idp";
 import { Translated } from "@/components/translated";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import {
   getActiveIdentityProviders,
   getBrandingSettings,
@@ -29,39 +29,27 @@ export default async function Page(props: { searchParams: Promise<Record<string
   let { firstname, lastname, email, organization, requestId } = searchParams;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   if (!organization) {
-    const org: Organization | null = await getDefaultOrg({
+    const org: Organization | null = await getDefaultOrg({ serviceConfig, });
-      serviceUrl,
-    });
     if (org) {
       organization = org.id;
     }
   }
 
-  const legal = await getLegalAndSupportSettings({
+  const legal = await getLegalAndSupportSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
-  const passwordComplexitySettings = await getPasswordComplexitySettings({
+  const passwordComplexitySettings = await getPasswordComplexitySettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
-  const loginSettings = await getLoginSettings({
+  const loginSettings = await getLoginSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
-  const identityProviders = await getActiveIdentityProviders({
+  const identityProviders = await getActiveIdentityProviders({ serviceConfig, orgId: organization,
-    serviceUrl,
-    orgId: organization,
   }).then((resp) => {
     return resp.identityProviders.filter((idp) => {
       return idp.options?.isAutoCreation || idp.options?.isCreationAllowed; // check if IDP allows to create account automatically or manual creation is allowed

apps/login/src/app/(login)/register/password/page.tsx

@@ -1,7 +1,7 @@
 import { DynamicTheme } from "@/components/dynamic-theme";
 import { SetRegisterPasswordForm } from "@/components/set-register-password-form";
 import { Translated } from "@/components/translated";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import {
   getBrandingSettings,
   getDefaultOrg,
@@ -18,12 +18,10 @@ export default async function Page(props: { searchParams: Promise<Record<string
   let { firstname, lastname, email, organization, requestId } = searchParams;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   if (!organization) {
-    const org: Organization | null = await getDefaultOrg({
+    const org: Organization | null = await getDefaultOrg({ serviceConfig, });
-      serviceUrl,
-    });
     if (org) {
       organization = org.id;
     }
@@ -31,23 +29,15 @@ export default async function Page(props: { searchParams: Promise<Record<string
 
   const missingData = !firstname || !lastname || !email || !organization;
 
-  const legal = await getLegalAndSupportSettings({
+  const legal = await getLegalAndSupportSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
-  const passwordComplexitySettings = await getPasswordComplexitySettings({
+  const passwordComplexitySettings = await getPasswordComplexitySettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
-  const loginSettings = await getLoginSettings({
+  const loginSettings = await getLoginSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
   return missingData ? (

apps/login/src/app/(login)/signedin/page.tsx

@@ -5,9 +5,9 @@ import { Translated } from "@/components/translated";
 import { UserAvatar } from "@/components/user-avatar";
 import { getMostRecentCookieWithLoginname, getSessionCookieById } from "@/lib/cookies";
 import { completeDeviceAuthorization } from "@/lib/server/device";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { loadMostRecentSession } from "@/lib/session";
-import { getBrandingSettings, getLoginSettings, getSession } from "@/lib/zitadel";
+import { getBrandingSettings, getLoginSettings, getSession, ServiceConfig } from "@/lib/zitadel";
 import { Metadata } from "next";
 import { getTranslations } from "next-intl/server";
 import { headers } from "next/headers";
@@ -18,11 +18,9 @@ export async function generateMetadata(): Promise<Metadata> {
   return { title: t("title", { user: "" }) };
 }
 
-async function loadSessionById(serviceUrl: string, sessionId: string, organization?: string) {
+async function loadSessionById(serviceConfig: ServiceConfig, sessionId: string, organization?: string) {
   const recent = await getSessionCookieById({ sessionId, organization });
-  return getSession({
+  return getSession({ serviceConfig, sessionId: recent.id,
-    serviceUrl,
-    sessionId: recent.id,
     sessionToken: recent.token,
   }).then((response) => {
     if (response?.session) {
@@ -35,13 +33,11 @@ export default async function Page(props: { searchParams: Promise<any> }) {
   const searchParams = await props.searchParams;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   const { loginName, requestId, organization, sessionId } = searchParams;
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
   // complete device authorization flow if device requestId is present
@@ -75,17 +71,13 @@ export default async function Page(props: { searchParams: Promise<any> }) {
   }
 
   const sessionFactors = sessionId
-    ? await loadSessionById(serviceUrl, sessionId, organization)
+    ? await loadSessionById(serviceConfig, sessionId, organization)
-    : await loadMostRecentSession({
+    : await loadMostRecentSession({ serviceConfig, sessionParams: { loginName, organization },
-        serviceUrl,
-        sessionParams: { loginName, organization },
       });
 
   let loginSettings;
   if (!requestId) {
-    loginSettings = await getLoginSettings({
+    loginSettings = await getLoginSettings({ serviceConfig, organization,
-      serviceUrl,
-      organization,
     });
   }
 

apps/login/src/app/(login)/u2f/page.tsx

@@ -4,7 +4,7 @@ import { LoginPasskey } from "@/components/login-passkey";
 import { Translated } from "@/components/translated";
 import { UserAvatar } from "@/components/user-avatar";
 import { getSessionCookieById } from "@/lib/cookies";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { loadMostRecentSession } from "@/lib/session";
 import { getBrandingSettings, getSession } from "@/lib/zitadel";
 import { Metadata } from "next";
@@ -22,25 +22,19 @@ export default async function Page(props: { searchParams: Promise<Record<string
   const { loginName, requestId, sessionId, organization } = searchParams;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
   const sessionFactors = sessionId
     ? await loadSessionById(sessionId, organization)
-    : await loadMostRecentSession({
+    : await loadMostRecentSession({ serviceConfig, sessionParams: { loginName, organization },
-        serviceUrl,
-        sessionParams: { loginName, organization },
       });
 
   async function loadSessionById(sessionId: string, organization?: string) {
     const recent = await getSessionCookieById({ sessionId, organization });
-    return getSession({
+    return getSession({ serviceConfig, sessionId: recent.id,
-      serviceUrl,
-      sessionId: recent.id,
       sessionToken: recent.token,
     }).then((response) => {
       if (response?.session) {

apps/login/src/app/(login)/u2f/set/page.tsx

@@ -3,7 +3,7 @@ import { DynamicTheme } from "@/components/dynamic-theme";
 import { RegisterU2f } from "@/components/register-u2f";
 import { Translated } from "@/components/translated";
 import { UserAvatar } from "@/components/user-avatar";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { loadMostRecentSession } from "@/lib/session";
 import { getBrandingSettings } from "@/lib/zitadel";
 import { Metadata } from "next";
@@ -21,19 +21,15 @@ export default async function Page(props: { searchParams: Promise<Record<string
   const { loginName, organization, requestId, checkAfter } = searchParams;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
-  const sessionFactors = await loadMostRecentSession({
+  const sessionFactors = await loadMostRecentSession({ serviceConfig, sessionParams: {
-    serviceUrl,
-    sessionParams: {
       loginName,
       organization,
     },
   });
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
   return (

apps/login/src/app/(login)/verify/page.tsx

@@ -3,9 +3,9 @@ import { DynamicTheme } from "@/components/dynamic-theme";
 import { Translated } from "@/components/translated";
 import { UserAvatar } from "@/components/user-avatar";
 import { VerifyForm } from "@/components/verify-form";
+import { getPublicHostWithProtocol } from "@/lib/server/host";
 import { sendEmailCode, sendInviteEmailCode } from "@/lib/server/verify";
-import { getOriginalHostWithProtocol } from "@/lib/server/host";
+import { getServiceConfig } from "@/lib/service-url";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
 import { loadMostRecentSession } from "@/lib/session";
 import { getBrandingSettings, getUserByID } from "@/lib/zitadel";
 import { HumanUser, User } from "@zitadel/proto/zitadel/user/v2/user_pb";
@@ -24,12 +24,9 @@ export default async function Page(props: { searchParams: Promise<any> }) {
   const { userId, loginName, code, organization, requestId, invite, send } = searchParams;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization });
-    serviceUrl,
-    organization,
-  });
 
   let sessionFactors;
   let user: User | undefined;
@@ -43,7 +40,7 @@ export default async function Page(props: { searchParams: Promise<any> }) {
   const basePath = process.env.NEXT_PUBLIC_BASE_PATH ?? "";
 
   async function sendEmail(userId: string) {
-    const hostWithProtocol = await getOriginalHostWithProtocol();
+    const hostWithProtocol = await getPublicHostWithProtocol(_headers);
 
     if (invite === "true") {
       await sendInviteEmailCode({
@@ -70,7 +67,7 @@ export default async function Page(props: { searchParams: Promise<any> }) {
 
   if ("loginName" in searchParams) {
     sessionFactors = await loadMostRecentSession({
-      serviceUrl,
+      serviceConfig,
       sessionParams: {
         loginName,
         organization,
@@ -85,10 +82,7 @@ export default async function Page(props: { searchParams: Promise<any> }) {
       await sendEmail(userId);
     }
 
-    const userResponse = await getUserByID({
+    const userResponse = await getUserByID({ serviceConfig, userId });
-      serviceUrl,
-      userId,
-    });
     if (userResponse) {
       user = userResponse.user;
       if (user?.type.case === "human") {

apps/login/src/app/(login)/verify/success/page.tsx

@@ -1,7 +1,7 @@
 import { DynamicTheme } from "@/components/dynamic-theme";
 import { Translated } from "@/components/translated";
 import { UserAvatar } from "@/components/user-avatar";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { loadMostRecentSession } from "@/lib/session";
 import { getBrandingSettings, getUserByID } from "@/lib/zitadel";
 import { HumanUser, User } from "@zitadel/proto/zitadel/user/v2/user_pb";
@@ -11,18 +11,14 @@ export default async function Page(props: { searchParams: Promise<any> }) {
   const searchParams = await props.searchParams;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   const { loginName, organization, userId } = searchParams;
 
-  const branding = await getBrandingSettings({
+  const branding = await getBrandingSettings({ serviceConfig, organization,
-    serviceUrl,
-    organization,
   });
 
-  const sessionFactors = await loadMostRecentSession({
+  const sessionFactors = await loadMostRecentSession({ serviceConfig, sessionParams: { loginName, organization },
-    serviceUrl,
-    sessionParams: { loginName, organization },
   }).catch((error) => {
     console.warn("Error loading session:", error);
   });
@@ -33,9 +29,7 @@ export default async function Page(props: { searchParams: Promise<any> }) {
     throw Error("Failed to get user id");
   }
 
-  const userResponse = await getUserByID({
+  const userResponse = await getUserByID({ serviceConfig, userId: id,
-    serviceUrl,
-    userId: id,
   });
 
   let user: User | undefined;

apps/login/src/app/login/route.ts

@@ -1,8 +1,8 @@
 import { getAllSessions } from "@/lib/cookies";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { validateAuthRequest, isRSCRequest } from "@/lib/auth-utils";
 import { handleOIDCFlowInitiation, handleSAMLFlowInitiation, FlowInitiationParams } from "@/lib/server/flow-initiation";
-import { listSessions } from "@/lib/zitadel";
+import { listSessions, ServiceConfig } from "@/lib/zitadel";
 import { Session } from "@zitadel/proto/zitadel/session/v2/session_pb";
 import { headers } from "next/headers";
 import { NextRequest, NextResponse } from "next/server";
@@ -13,18 +13,15 @@ export const fetchCache = "default-no-store";
 // Add this to prevent RSC requests
 export const runtime = "nodejs";
 
-async function loadSessions({ serviceUrl, ids }: { serviceUrl: string; ids: string[] }): Promise<Session[]> {
+async function loadSessions({ serviceConfig, ids }: { serviceConfig: ServiceConfig; ids: string[] }): Promise<Session[]> {
-  const response = await listSessions({
+  const response = await listSessions({ serviceConfig, ids: ids.filter((id: string | undefined) => !!id) });
-    serviceUrl,
-    ids: ids.filter((id: string | undefined) => !!id),
-  });
 
   return response?.sessions ?? [];
 }
 
 export async function GET(request: NextRequest) {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   const searchParams = request.nextUrl.searchParams;
 
@@ -43,17 +40,11 @@ export async function GET(request: NextRequest) {
   const ids = sessionCookies.map((s) => s.id);
   let sessions: Session[] = [];
   if (ids && ids.length) {
-    sessions = await loadSessions({ serviceUrl, ids });
+    sessions = await loadSessions({ serviceConfig, ids });
   }
 
   // Flow initiation - delegate to appropriate handler
-  const flowParams: FlowInitiationParams = {
+  const flowParams: FlowInitiationParams = { serviceConfig, requestId, sessions, sessionCookies, request };
-    serviceUrl,
-    requestId,
-    sessions,
-    sessionCookies,
-    request,
-  };
 
   if (requestId.startsWith("oidc_")) {
     return handleOIDCFlowInitiation(flowParams);

apps/login/src/app/security/route.ts

@@ -1,5 +1,5 @@
 import { createServiceForHost } from "@/lib/service";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { Client } from "@zitadel/client";
 import { SettingsService } from "@zitadel/proto/zitadel/settings/v2/settings_service_pb";
 import { headers } from "next/headers";
@@ -7,10 +7,10 @@ import { NextResponse } from "next/server";
 
 export async function GET() {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   const settingsService: Client<typeof SettingsService> =
-    await createServiceForHost(SettingsService, serviceUrl);
+    await createServiceForHost(SettingsService, serviceConfig);
 
   const settings = await settingsService
     .getSecuritySettings({})

apps/login/src/i18n/request.ts

@@ -1,5 +1,5 @@
 import { LANGS, LANGUAGE_COOKIE_NAME, LANGUAGE_HEADER_NAME } from "@/lib/i18n";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import { getHostedLoginTranslation } from "@/lib/zitadel";
 import { JsonObject } from "@zitadel/client";
 import deepmerge from "deepmerge";
@@ -13,7 +13,7 @@ export default getRequestConfig(async () => {
   let locale: string = fallback;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   const languageHeader = await (await headers()).get(LANGUAGE_HEADER_NAME);
   if (languageHeader) {
@@ -34,9 +34,7 @@ export default getRequestConfig(async () => {
 
   let translations: JsonObject | {} = {};
   try {
-    const i18nJSON = await getHostedLoginTranslation({
+    const i18nJSON = await getHostedLoginTranslation({ serviceConfig, locale,
-      serviceUrl,
-      locale,
       organization: i18nOrganization,
     });
 

apps/login/src/lib/deployment.test.ts

@@ -0,0 +1,77 @@
+import { describe, expect, test, beforeEach, afterEach } from "vitest";
+import { hasSystemUserCredentials, hasServiceUserToken } from "./deployment";
+
+describe("Deployment utilities", () => {
+  const originalEnv = process.env;
+
+  beforeEach(() => {
+    // Reset environment before each test
+    process.env = { ...originalEnv };
+  });
+
+  afterEach(() => {
+    process.env = originalEnv;
+  });
+
+  describe("hasSystemUserCredentials", () => {
+    test("should return true when all system user credentials are present", () => {
+      process.env.AUDIENCE = "https://api.zitadel.cloud";
+      process.env.SYSTEM_USER_ID = "12345";
+      process.env.SYSTEM_USER_PRIVATE_KEY = "-----BEGIN PRIVATE KEY-----\n...";
+
+      expect(hasSystemUserCredentials()).toBe(true);
+    });
+
+    test("should return false when AUDIENCE is missing", () => {
+      process.env.AUDIENCE = undefined as any;
+      process.env.SYSTEM_USER_ID = "12345";
+      process.env.SYSTEM_USER_PRIVATE_KEY = "-----BEGIN PRIVATE KEY-----\n...";
+
+      expect(hasSystemUserCredentials()).toBe(false);
+    });
+
+    test("should return false when SYSTEM_USER_ID is missing", () => {
+      process.env.AUDIENCE = "https://api.zitadel.cloud";
+      process.env.SYSTEM_USER_ID = undefined as any;
+      process.env.SYSTEM_USER_PRIVATE_KEY = "-----BEGIN PRIVATE KEY-----\n...";
+
+      expect(hasSystemUserCredentials()).toBe(false);
+    });
+
+    test("should return false when SYSTEM_USER_PRIVATE_KEY is missing", () => {
+      process.env.AUDIENCE = "https://api.zitadel.cloud";
+      process.env.SYSTEM_USER_ID = "12345";
+      process.env.SYSTEM_USER_PRIVATE_KEY = undefined as any;
+
+      expect(hasSystemUserCredentials()).toBe(false);
+    });
+
+    test("should return false when all credentials are missing", () => {
+      process.env.AUDIENCE = undefined as any;
+      process.env.SYSTEM_USER_ID = undefined as any;
+      process.env.SYSTEM_USER_PRIVATE_KEY = undefined as any;
+
+      expect(hasSystemUserCredentials()).toBe(false);
+    });
+  });
+
+  describe("hasServiceUserToken", () => {
+    test("should return true when ZITADEL_SERVICE_USER_TOKEN is present", () => {
+      process.env.ZITADEL_SERVICE_USER_TOKEN = "token123";
+
+      expect(hasServiceUserToken()).toBe(true);
+    });
+
+    test("should return false when ZITADEL_SERVICE_USER_TOKEN is not set", () => {
+      process.env.ZITADEL_SERVICE_USER_TOKEN = undefined as any;
+
+      expect(hasServiceUserToken()).toBe(false);
+    });
+
+    test("should return false when ZITADEL_SERVICE_USER_TOKEN is empty string", () => {
+      process.env.ZITADEL_SERVICE_USER_TOKEN = "";
+
+      expect(hasServiceUserToken()).toBe(false);
+    });
+  });
+});

apps/login/src/lib/deployment.ts

@@ -0,0 +1,24 @@
+/**
+ * Checks if system user credentials are available for JWT authentication.
+ *
+ * System user authentication requires:
+ * - AUDIENCE: The API audience for JWT authentication
+ * - SYSTEM_USER_ID: The system user's ID
+ * - SYSTEM_USER_PRIVATE_KEY: The private key for JWT signing
+ *
+ * Both multi-tenant and self-hosted deployments can use system user authentication.
+ *
+ * @returns true if system user credentials are present, false otherwise
+ */
+export function hasSystemUserCredentials(): boolean {
+  return !!process.env.AUDIENCE && !!process.env.SYSTEM_USER_ID && !!process.env.SYSTEM_USER_PRIVATE_KEY;
+}
+
+/**
+ * Checks if service user token is available for authentication.
+ *
+ * @returns true if ZITADEL_SERVICE_USER_TOKEN is present, false otherwise
+ */
+export function hasServiceUserToken(): boolean {
+  return !!process.env.ZITADEL_SERVICE_USER_TOKEN;
+}

apps/login/src/lib/oidc.ts

@@ -1,25 +1,19 @@
 import { Cookie } from "@/lib/cookies";
 import { sendLoginname, SendLoginnameCommand } from "@/lib/server/loginname";
-import { createCallback, getLoginSettings } from "@/lib/zitadel";
+import { createCallback, getLoginSettings, ServiceConfig } from "@/lib/zitadel";
 import { create } from "@zitadel/client";
 import { CreateCallbackRequestSchema, SessionSchema } from "@zitadel/proto/zitadel/oidc/v2/oidc_service_pb";
 import { Session } from "@zitadel/proto/zitadel/session/v2/session_pb";
 import { isSessionValid } from "./session";
 
 type LoginWithOIDCAndSession = {
-  serviceUrl: string;
+  serviceConfig: ServiceConfig;
   authRequest: string;
   sessionId: string;
   sessions: Session[];
   sessionCookies: Cookie[];
 };
-export async function loginWithOIDCAndSession({
+export async function loginWithOIDCAndSession({ serviceConfig, authRequest, sessionId, sessions, sessionCookies }: LoginWithOIDCAndSession): Promise<{ error: string } | { redirect: string }> {
-  serviceUrl,
-  authRequest,
-  sessionId,
-  sessions,
-  sessionCookies,
-}: LoginWithOIDCAndSession): Promise<{ error: string } | { redirect: string }> {
   console.log(`Login with session: ${sessionId} and authRequest: ${authRequest}`);
 
   const selectedSession = sessions.find((s) => s.id === sessionId);
@@ -27,10 +21,7 @@ export async function loginWithOIDCAndSession({
   if (selectedSession && selectedSession.id) {
     console.log(`Found session ${selectedSession.id}`);
 
-    const isValid = await isSessionValid({
+    const isValid = await isSessionValid({ serviceConfig, session: selectedSession });
-      serviceUrl,
-      session: selectedSession,
-    });
 
     console.log("Session is valid:", isValid);
 
@@ -61,9 +52,7 @@ export async function loginWithOIDCAndSession({
       };
 
       try {
-        const { callbackUrl } = await createCallback({
+        const { callbackUrl } = await createCallback({ serviceConfig, req: create(CreateCallbackRequestSchema, {
-          serviceUrl,
-          req: create(CreateCallbackRequestSchema, {
             authRequestId: authRequest,
             callbackKind: {
               case: "session",
@@ -81,10 +70,7 @@ export async function loginWithOIDCAndSession({
         // handle already handled gracefully as these could come up if old emails with requestId are used (reset password, register emails etc.)
         console.error(error);
         if (error && typeof error === "object" && "code" in error && error?.code === 9) {
-          const loginSettings = await getLoginSettings({
+          const loginSettings = await getLoginSettings({ serviceConfig, organization: selectedSession.factors?.user?.organizationId });
-            serviceUrl,
-            organization: selectedSession.factors?.user?.organizationId,
-          });
 
           if (loginSettings?.defaultRedirectUri) {
             return { redirect: loginSettings.defaultRedirectUri };

apps/login/src/lib/saml.ts

@@ -1,6 +1,6 @@
 import { Cookie } from "@/lib/cookies";
 import { sendLoginname, SendLoginnameCommand } from "@/lib/server/loginname";
-import { createResponse, getLoginSettings } from "@/lib/zitadel";
+import { createResponse, getLoginSettings, ServiceConfig } from "@/lib/zitadel";
 import { create } from "@zitadel/client";
 import { CreateResponseRequestSchema } from "@zitadel/proto/zitadel/saml/v2/saml_service_pb";
 import { Session } from "@zitadel/proto/zitadel/session/v2/session_pb";
@@ -9,7 +9,7 @@ import { v4 as uuidv4 } from "uuid";
 import { isSessionValid } from "./session";
 
 type LoginWithSAMLAndSession = {
-  serviceUrl: string;
+  serviceConfig: ServiceConfig;
   samlRequest: string;
   sessionId: string;
   sessions: Session[];
@@ -82,13 +82,7 @@ export async function getSAMLFormCookie(uid: string): Promise<string | null> {
   }
 }
 
-export async function loginWithSAMLAndSession({
+export async function loginWithSAMLAndSession({ serviceConfig, samlRequest, sessionId, sessions, sessionCookies }: LoginWithSAMLAndSession): Promise<{ error: string } | { redirect: string }> {
-  serviceUrl,
-  samlRequest,
-  sessionId,
-  sessions,
-  sessionCookies,
-}: LoginWithSAMLAndSession): Promise<{ error: string } | { redirect: string }> {
   console.log(`Login with session: ${sessionId} and samlRequest: ${samlRequest}`);
 
   const selectedSession = sessions.find((s) => s.id === sessionId);
@@ -96,10 +90,7 @@ export async function loginWithSAMLAndSession({
   if (selectedSession && selectedSession.id) {
     console.log(`Found session ${selectedSession.id}`);
 
-    const isValid = await isSessionValid({
+    const isValid = await isSessionValid({ serviceConfig, session: selectedSession });
-      serviceUrl,
-      session: selectedSession,
-    });
 
     console.log("Session is valid:", isValid);
 
@@ -129,9 +120,7 @@ export async function loginWithSAMLAndSession({
 
       // works not with _rsc request
       try {
-        const { url } = await createResponse({
+        const { url } = await createResponse({ serviceConfig, req: create(CreateResponseRequestSchema, {
-          serviceUrl,
-          req: create(CreateResponseRequestSchema, {
             samlRequestId: samlRequest,
             responseKind: {
               case: "session",
@@ -149,10 +138,7 @@ export async function loginWithSAMLAndSession({
         console.error(error);
 
         if (error && typeof error === "object" && "code" in error && error?.code === 9) {
-          const loginSettings = await getLoginSettings({
+          const loginSettings = await getLoginSettings({ serviceConfig, organization: selectedSession.factors?.user?.organizationId });
-            serviceUrl,
-            organization: selectedSession.factors?.user?.organizationId,
-          });
 
           if (loginSettings?.defaultRedirectUri) {
             return { redirect: loginSettings.defaultRedirectUri };

apps/login/src/lib/self.ts

@@ -3,14 +3,11 @@
 import { createUserServiceClient } from "@zitadel/client/v2";
 import { headers } from "next/headers";
 import { getSessionCookieById } from "./cookies";
-import { getServiceUrlFromHeaders } from "./service-url";
+import { getServiceConfig } from "./service-url";
-import { createServerTransport, getSession } from "./zitadel";
+import { createServerTransport, getSession, ServiceConfig } from "./zitadel";
 
-const myUserService = async (serviceUrl: string, sessionToken: string) => {
+const myUserService = async (serviceConfig: ServiceConfig, sessionToken: string) => {
-  const transportPromise = await createServerTransport(
+  const transportPromise = await createServerTransport(sessionToken, serviceConfig);
-    sessionToken,
-    serviceUrl,
-  );
   return createUserServiceClient(transportPromise);
 };
 
@@ -22,13 +19,11 @@ export async function setMyPassword({
   password: string;
 }) {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   const sessionCookie = await getSessionCookieById({ sessionId });
 
-  const { session } = await getSession({
+  const { session } = await getSession({ serviceConfig, sessionId: sessionCookie.id,
-    serviceUrl,
-    sessionId: sessionCookie.id,
     sessionToken: sessionCookie.token,
   });
 
@@ -36,7 +31,7 @@ export async function setMyPassword({
     return { error: "Could not load session" };
   }
 
-  const service = await myUserService(serviceUrl, `${sessionCookie.token}`);
+  const service = await myUserService(serviceConfig, `${sessionCookie.token}`);
 
   if (!session?.factors?.user?.id) {
     return { error: "No user id found in session" };

apps/login/src/lib/server/auth-flow.ts

@@ -3,8 +3,8 @@
 import { getAllSessions } from "@/lib/cookies";
 import { loginWithOIDCAndSession } from "@/lib/oidc";
 import { loginWithSAMLAndSession } from "@/lib/saml";
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
-import { listSessions } from "@/lib/zitadel";
+import { listSessions, ServiceConfig } from "@/lib/zitadel";
 import { Session } from "@zitadel/proto/zitadel/session/v2/session_pb";
 import { headers } from "next/headers";
 
@@ -14,10 +14,8 @@ export interface AuthFlowParams {
   organization?: string;
 }
 
-async function loadSessions({ serviceUrl, ids }: { serviceUrl: string; ids: string[] }): Promise<Session[]> {
+async function loadSessions({ serviceConfig, ids }: { serviceConfig: ServiceConfig; ids: string[] }): Promise<Session[]> {
-  const response = await listSessions({
+  const response = await listSessions({ serviceConfig, ids: ids.filter((id: string | undefined) => !!id),
-    serviceUrl,
-    ids: ids.filter((id: string | undefined) => !!id),
   });
 
   return response?.sessions ?? [];
@@ -33,21 +31,19 @@ export async function completeAuthFlow(command: AuthFlowParams): Promise<{ error
   const { sessionId, requestId } = command;
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   const sessionCookies = await getAllSessions();
   const ids = sessionCookies.map((s) => s.id);
   let sessions: Session[] = [];
 
   if (ids && ids.length) {
-    sessions = await loadSessions({ serviceUrl, ids });
+    sessions = await loadSessions({ serviceConfig, ids });
   }
 
   if (requestId.startsWith("oidc_")) {
     // Complete OIDC flow
-    const result = await loginWithOIDCAndSession({
+    const result = await loginWithOIDCAndSession({ serviceConfig, authRequest: requestId.replace("oidc_", ""),
-      serviceUrl,
-      authRequest: requestId.replace("oidc_", ""),
       sessionId,
       sessions,
       sessionCookies,
@@ -62,9 +58,7 @@ export async function completeAuthFlow(command: AuthFlowParams): Promise<{ error
     return result;
   } else if (requestId.startsWith("saml_")) {
     // Complete SAML flow
-    const result = await loginWithSAMLAndSession({
+    const result = await loginWithSAMLAndSession({ serviceConfig, samlRequest: requestId.replace("saml_", ""),
-      serviceUrl,
-      samlRequest: requestId.replace("saml_", ""),
       sessionId,
       sessions,
       sessionCookies,

apps/login/src/lib/server/cookie.ts

@@ -14,7 +14,7 @@ import { Challenges, RequestChallenges } from "@zitadel/proto/zitadel/session/v2
 import { Session } from "@zitadel/proto/zitadel/session/v2/session_pb";
 import { Checks } from "@zitadel/proto/zitadel/session/v2/session_service_pb";
 import { headers } from "next/headers";
-import { getServiceUrlFromHeaders } from "../service-url";
+import { getServiceConfig } from "../service-url";
 
 type CustomCookieData = {
   id: string;
@@ -46,7 +46,7 @@ export async function createSessionAndUpdateCookie(command: {
   lifetime?: Duration;
 }): Promise<Session> {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   let sessionLifetime = command.lifetime;
 
@@ -59,16 +59,12 @@ export async function createSessionAndUpdateCookie(command: {
     } as Duration; // for usecases where the lifetime is not specified (user discovery)
   }
 
-  const createdSession = await createSessionFromChecks({
+  const createdSession = await createSessionFromChecks({ serviceConfig, checks: command.checks,
-    serviceUrl,
-    checks: command.checks,
     lifetime: sessionLifetime,
   });
 
   if (createdSession) {
-    return getSession({
+    return getSession({ serviceConfig, sessionId: createdSession.sessionId,
-      serviceUrl,
-      sessionId: createdSession.sessionId,
       sessionToken: createdSession.sessionToken,
     }).then(async (response) => {
       if (response?.session && response.session?.factors?.user?.loginName) {
@@ -89,7 +85,7 @@ export async function createSessionAndUpdateCookie(command: {
           sessionCookie.organization = response.session.factors.user.organizationId;
         }
 
-        const securitySettings = await getSecuritySettings({ serviceUrl });
+        const securitySettings = await getSecuritySettings({ serviceConfig });
         const iFrameEnabled = !!securitySettings?.embeddedIframe?.enabled;
 
         await addSessionToCookie({ session: sessionCookie, iFrameEnabled });
@@ -119,7 +115,7 @@ export async function createSessionForIdpAndUpdateCookie({
   lifetime?: Duration;
 }): Promise<Session> {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   let sessionLifetime = lifetime;
 
@@ -132,9 +128,7 @@ export async function createSessionForIdpAndUpdateCookie({
     } as Duration;
   }
 
-  const createdSession = await createSessionForUserIdAndIdpIntent({
+  const createdSession = await createSessionForUserIdAndIdpIntent({ serviceConfig, userId,
-    serviceUrl,
-    userId,
     idpIntent,
     lifetime: sessionLifetime,
   }).catch((error: ErrorDetail | CredentialsCheckError) => {
@@ -152,9 +146,7 @@ export async function createSessionForIdpAndUpdateCookie({
     throw "Could not create session";
   }
 
-  const { session } = await getSession({
+  const { session } = await getSession({ serviceConfig, sessionId: createdSession.sessionId,
-    serviceUrl,
-    sessionId: createdSession.sessionId,
     sessionToken: createdSession.sessionToken,
   });
 
@@ -180,7 +172,7 @@ export async function createSessionForIdpAndUpdateCookie({
     sessionCookie.organization = session.factors.user.organizationId;
   }
 
-  const securitySettings = await getSecuritySettings({ serviceUrl });
+  const securitySettings = await getSecuritySettings({ serviceConfig });
   const iFrameEnabled = !!securitySettings?.embeddedIframe?.enabled;
 
   return addSessionToCookie({ session: sessionCookie, iFrameEnabled }).then(() => {
@@ -200,11 +192,9 @@ export async function setSessionAndUpdateCookie(command: {
   lifetime: Duration;
 }) {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
-  return setSession({
+  return setSession({ serviceConfig, sessionId: command.recentCookie.id,
-    serviceUrl,
-    sessionId: command.recentCookie.id,
     sessionToken: command.recentCookie.token,
     challenges: command.challenges,
     checks: command.checks,
@@ -227,9 +217,7 @@ export async function setSessionAndUpdateCookie(command: {
           sessionCookie.requestId = command.requestId;
         }
 
-        return getSession({
+        return getSession({ serviceConfig, sessionId: sessionCookie.id,
-          serviceUrl,
-          sessionId: sessionCookie.id,
           sessionToken: sessionCookie.token,
         }).then(async (response) => {
           if (!response?.session || !response.session.factors?.user?.loginName) {
@@ -252,7 +240,7 @@ export async function setSessionAndUpdateCookie(command: {
             newCookie.requestId = sessionCookie.requestId;
           }
 
-          const securitySettings = await getSecuritySettings({ serviceUrl });
+          const securitySettings = await getSecuritySettings({ serviceConfig });
           const iFrameEnabled = !!securitySettings?.embeddedIframe?.enabled;
 
           return updateSessionCookie({

apps/login/src/lib/server/device.ts

@@ -2,19 +2,17 @@
 
 import { authorizeOrDenyDeviceAuthorization } from "@/lib/zitadel";
 import { headers } from "next/headers";
-import { getServiceUrlFromHeaders } from "../service-url";
+import { getServiceConfig } from "../service-url";
 
 export async function completeDeviceAuthorization(
   deviceAuthorizationId: string,
   session?: { sessionId: string; sessionToken: string },
 ) {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   // without the session, device auth request is denied
-  return authorizeOrDenyDeviceAuthorization({
+  return authorizeOrDenyDeviceAuthorization({ serviceConfig, deviceAuthorizationId,
-    serviceUrl,
-    deviceAuthorizationId,
     session,
   });
 }

apps/login/src/lib/server/flow-initiation.ts

@@ -9,6 +9,7 @@ import {
   getSAMLRequest,
   getSecuritySettings,
   startIdentityProviderFlow,
+  ServiceConfig,
 } from "@/lib/zitadel";
 import { sendLoginname, SendLoginnameCommand } from "@/lib/server/loginname";
 import { idpTypeToSlug } from "@/lib/idp";
@@ -47,7 +48,7 @@ const gotoAccounts = ({
 };
 
 export interface FlowInitiationParams {
-  serviceUrl: string;
+  serviceConfig: ServiceConfig;
   requestId: string;
   sessions: Session[];
   sessionCookies: any[];
@@ -58,11 +59,9 @@ export interface FlowInitiationParams {
  * Handle OIDC flow initiation
  */
 export async function handleOIDCFlowInitiation(params: FlowInitiationParams): Promise<NextResponse> {
-  const { serviceUrl, requestId, sessions, sessionCookies, request } = params;
+  const { serviceConfig, requestId, sessions, sessionCookies, request } = params;
 
-  const { authRequest } = await getAuthRequest({
+  const { authRequest } = await getAuthRequest({ serviceConfig, authRequestId: requestId.replace("oidc_", ""),
-    serviceUrl,
-    authRequestId: requestId.replace("oidc_", ""),
   });
 
   let organization = "";
@@ -85,9 +84,7 @@ export async function handleOIDCFlowInitiation(params: FlowInitiationParams): Pr
 
         console.log("Extracted org domain:", orgDomain);
         if (orgDomain) {
-          const orgs = await getOrgsByDomain({
+          const orgs = await getOrgsByDomain({ serviceConfig, domain: orgDomain,
-            serviceUrl,
-            domain: orgDomain,
           });
 
           if (orgs.result && orgs.result.length === 1) {
@@ -102,9 +99,7 @@ export async function handleOIDCFlowInitiation(params: FlowInitiationParams): Pr
       const matched = IDP_SCOPE_REGEX.exec(idpScope);
       idpId = matched?.[1] ?? "";
 
-      const identityProviders = await getActiveIdentityProviders({
+      const identityProviders = await getActiveIdentityProviders({ serviceConfig, orgId: organization ? organization : undefined,
-        serviceUrl,
-        orgId: organization ? organization : undefined,
       }).then((resp) => {
         return resp.identityProviders;
       });
@@ -137,9 +132,7 @@ export async function handleOIDCFlowInitiation(params: FlowInitiationParams): Pr
           params.set("organization", organization);
         }
 
-        let url: string | null = await startIdentityProviderFlow({
+        let url: string | null = await startIdentityProviderFlow({ serviceConfig, idpId,
-          serviceUrl,
-          idpId,
           urls: {
             successUrl: `${origin}/idp/${provider}/process?` + new URLSearchParams(params),
             failureUrl: `${origin}/idp/${provider}/failure?` + new URLSearchParams(params),
@@ -215,13 +208,9 @@ export async function handleOIDCFlowInitiation(params: FlowInitiationParams): Pr
       }
       return NextResponse.redirect(loginNameUrl);
     } else if (authRequest.prompt.includes(Prompt.NONE)) {
-      const securitySettings = await getSecuritySettings({
+      const securitySettings = await getSecuritySettings({ serviceConfig, });
-        serviceUrl,
-      });
 
-      const selectedSession = await findValidSession({
+      const selectedSession = await findValidSession({ serviceConfig, sessions,
-        serviceUrl,
-        sessions,
         authRequest,
       });
 
@@ -251,9 +240,7 @@ export async function handleOIDCFlowInitiation(params: FlowInitiationParams): Pr
         sessionToken: cookie.token,
       };
 
-      const { callbackUrl } = await createCallback({
+      const { callbackUrl } = await createCallback({ serviceConfig, req: create(CreateCallbackRequestSchema, {
-        serviceUrl,
-        req: create(CreateCallbackRequestSchema, {
           authRequestId: requestId.replace("oidc_", ""),
           callbackKind: {
             case: "session",
@@ -275,9 +262,7 @@ export async function handleOIDCFlowInitiation(params: FlowInitiationParams): Pr
 
       return callbackResponse;
     } else {
-      let selectedSession = await findValidSession({
+      let selectedSession = await findValidSession({ serviceConfig, sessions,
-        serviceUrl,
-        sessions,
         authRequest,
       });
 
@@ -305,9 +290,7 @@ export async function handleOIDCFlowInitiation(params: FlowInitiationParams): Pr
       };
 
       try {
-        const { callbackUrl } = await createCallback({
+        const { callbackUrl } = await createCallback({ serviceConfig, req: create(CreateCallbackRequestSchema, {
-          serviceUrl,
-          req: create(CreateCallbackRequestSchema, {
             authRequestId: requestId.replace("oidc_", ""),
             callbackKind: {
               case: "session",
@@ -359,11 +342,9 @@ export async function handleOIDCFlowInitiation(params: FlowInitiationParams): Pr
  * Handle SAML flow initiation
  */
 export async function handleSAMLFlowInitiation(params: FlowInitiationParams): Promise<NextResponse> {
-  const { serviceUrl, requestId, sessions, sessionCookies, request } = params;
+  const { serviceConfig, requestId, sessions, sessionCookies, request } = params;
 
-  const { samlRequest } = await getSAMLRequest({
+  const { samlRequest } = await getSAMLRequest({ serviceConfig, samlRequestId: requestId.replace("saml_", ""),
-    serviceUrl,
-    samlRequestId: requestId.replace("saml_", ""),
   });
 
   if (!samlRequest) {
@@ -378,9 +359,7 @@ export async function handleSAMLFlowInitiation(params: FlowInitiationParams): Pr
   }
 
   // Try to find a valid session
-  let selectedSession = await findValidSession({
+  let selectedSession = await findValidSession({ serviceConfig, sessions,
-    serviceUrl,
-    sessions,
     samlRequest,
   });
 
@@ -410,9 +389,7 @@ export async function handleSAMLFlowInitiation(params: FlowInitiationParams): Pr
   };
 
   try {
-    const { url, binding } = await createResponse({
+    const { url, binding } = await createResponse({ serviceConfig, req: create(CreateResponseRequestSchema, {
-      serviceUrl,
-      req: create(CreateResponseRequestSchema, {
         samlRequestId: requestId.replace("saml_", ""),
         responseKind: {
           case: "session",

apps/login/src/lib/server/host.test.ts

@@ -1,10 +1,5 @@
 import { describe, expect, test, vi, beforeEach, afterEach } from "vitest";
-import { getOriginalHost, getOriginalHostWithProtocol } from "./host";
+import { getInstanceHost, getPublicHostWithProtocol, getPublicHost } from "./host";
-
-// Mock the Next.js headers function
-vi.mock("next/headers", () => ({
-  headers: vi.fn(),
-}));
 
 describe("Host utility functions", () => {
   beforeEach(() => {
@@ -15,151 +10,94 @@ describe("Host utility functions", () => {
     vi.restoreAllMocks();
   });
 
-  describe("getOriginalHost", () => {
+  describe("getInstanceHost", () => {
-    test("should return x-forwarded-host when available", async () => {
+    test("should use x-zitadel-instance-host when available", () => {
-      const { headers } = await import("next/headers");
       const mockHeaders = {
         get: vi.fn((key: string) => {
-          if (key === "x-forwarded-host") return "zitadel.com";
+          if (key === "x-zitadel-instance-host") return "instance.zitadel.cloud";
-          if (key === "x-original-host") return "backup.com";
+          if (key === "x-zitadel-forward-host") return "forward.zitadel.cloud";
-          if (key === "host") return "internal.vercel.app";
           return null;
         }),
-      };
+      } as any;
 
-      vi.mocked(headers).mockResolvedValue(mockHeaders as any);
+      const result = getInstanceHost(mockHeaders);
-
+      expect(result).toBe("instance.zitadel.cloud");
-      const result = await getOriginalHost();
+      expect(mockHeaders.get).toHaveBeenCalledWith("x-zitadel-instance-host");
-      expect(result).toBe("zitadel.com");
-      expect(mockHeaders.get).toHaveBeenCalledWith("x-forwarded-host");
     });
 
-    test("should fall back to x-original-host when x-forwarded-host is not available", async () => {
+    test("should use x-zitadel-forward-host when x-zitadel-instance-host is not available", () => {
-      const { headers } = await import("next/headers");
       const mockHeaders = {
         get: vi.fn((key: string) => {
-          if (key === "x-forwarded-host") return null;
+          if (key === "x-zitadel-instance-host") return null;
-          if (key === "x-original-host") return "original.com";
+          if (key === "x-zitadel-forward-host") return "forward.zitadel.cloud";
-          if (key === "host") return "internal.vercel.app";
           return null;
         }),
-      };
+      } as any;
 
-      vi.mocked(headers).mockResolvedValue(mockHeaders as any);
+      const result = getInstanceHost(mockHeaders);
-
+      expect(result).toBe("forward.zitadel.cloud");
-      const result = await getOriginalHost();
+      expect(mockHeaders.get).toHaveBeenCalledWith("x-zitadel-instance-host");
-      expect(result).toBe("original.com");
+      expect(mockHeaders.get).toHaveBeenCalledWith("x-zitadel-forward-host");
-      expect(mockHeaders.get).toHaveBeenCalledWith("x-forwarded-host");
-      expect(mockHeaders.get).toHaveBeenCalledWith("x-original-host");
     });
 
-    test("should fall back to host when forwarded headers are not available", async () => {
+    test("should return null when neither x-zitadel-instance-host nor x-zitadel-forward-host are available", () => {
-      const { headers } = await import("next/headers");
       const mockHeaders = {
         get: vi.fn((key: string) => {
-          if (key === "x-forwarded-host") return null;
+          if (key === "x-zitadel-instance-host") return null;
-          if (key === "x-original-host") return null;
+          if (key === "x-zitadel-forward-host") return null;
-          if (key === "host") return "fallback.com";
+          if (key === "x-forwarded-host") return "accounts.mycompany.com";
+          if (key === "host") return "internal.server";
           return null;
         }),
-      };
+      } as any;
 
-      vi.mocked(headers).mockResolvedValue(mockHeaders as any);
+      const result = getInstanceHost(mockHeaders);
-
+      expect(result).toBeNull();
-      const result = await getOriginalHost();
+      expect(mockHeaders.get).toHaveBeenCalledWith("x-zitadel-instance-host");
-      expect(result).toBe("fallback.com");
+      expect(mockHeaders.get).toHaveBeenCalledWith("x-zitadel-forward-host");
-      expect(mockHeaders.get).toHaveBeenCalledWith("x-forwarded-host");
-      expect(mockHeaders.get).toHaveBeenCalledWith("x-original-host");
-      expect(mockHeaders.get).toHaveBeenCalledWith("host");
-    });
-
-    test("should throw error when no host is found", async () => {
-      const { headers } = await import("next/headers");
-      const mockHeaders = {
-        get: vi.fn(() => null),
-      };
-
-      vi.mocked(headers).mockResolvedValue(mockHeaders as any);
-
-      await expect(getOriginalHost()).rejects.toThrow("No host found in headers");
-    });
-
-    test("should throw error when host is empty string", async () => {
-      const { headers } = await import("next/headers");
-      const mockHeaders = {
-        get: vi.fn(() => ""),
-      };
-
-      vi.mocked(headers).mockResolvedValue(mockHeaders as any);
-
-      await expect(getOriginalHost()).rejects.toThrow("No host found in headers");
-    });
-
-    test("should throw error when host is not a string", async () => {
-      const { headers } = await import("next/headers");
-      const mockHeaders = {
-        get: vi.fn(() => 123),
-      };
-
-      vi.mocked(headers).mockResolvedValue(mockHeaders as any);
-
-      await expect(getOriginalHost()).rejects.toThrow("No host found in headers");
     });
   });
 
-  describe("getOriginalHostWithProtocol", () => {
+  describe("getPublicHostWithProtocol", () => {
-    test("should return https for production domain", async () => {
+    test("should return https for production domain", () => {
-      const { headers } = await import("next/headers");
       const mockHeaders = {
         get: vi.fn(() => "zitadel.com"),
-      };
+      } as any;
 
-      vi.mocked(headers).mockResolvedValue(mockHeaders as any);
+      const result = getPublicHostWithProtocol(mockHeaders);
-
-      const result = await getOriginalHostWithProtocol();
       expect(result).toBe("https://zitadel.com");
     });
 
-    test("should return http for localhost", async () => {
+    test("should return http for localhost", () => {
-      const { headers } = await import("next/headers");
       const mockHeaders = {
         get: vi.fn(() => "localhost:3000"),
-      };
+      } as any;
 
-      vi.mocked(headers).mockResolvedValue(mockHeaders as any);
+      const result = getPublicHostWithProtocol(mockHeaders);
-
-      const result = await getOriginalHostWithProtocol();
       expect(result).toBe("http://localhost:3000");
     });
 
-    test("should return http for localhost without port", async () => {
+    test("should return http for localhost without port", () => {
-      const { headers } = await import("next/headers");
       const mockHeaders = {
         get: vi.fn(() => "localhost"),
-      };
+      } as any;
 
-      vi.mocked(headers).mockResolvedValue(mockHeaders as any);
+      const result = getPublicHostWithProtocol(mockHeaders);
-
-      const result = await getOriginalHostWithProtocol();
       expect(result).toBe("http://localhost");
     });
 
-    test("should return https for custom domain", async () => {
+    test("should return https for custom domain", () => {
-      const { headers } = await import("next/headers");
       const mockHeaders = {
         get: vi.fn(() => "auth.company.com"),
-      };
+      } as any;
 
-      vi.mocked(headers).mockResolvedValue(mockHeaders as any);
+      const result = getPublicHostWithProtocol(mockHeaders);
-
-      const result = await getOriginalHostWithProtocol();
       expect(result).toBe("https://auth.company.com");
     });
   });
 
   describe("Real-world scenarios", () => {
-    test("should handle Vercel rewrite scenario", async () => {
+    test("should handle Vercel rewrite scenario", () => {
-      const { headers } = await import("next/headers");
       const mockHeaders = {
         get: vi.fn((key: string) => {
           // Simulate Vercel rewrite: zitadel.com/login -> login-zitadel-qa.vercel.app
@@ -167,16 +105,13 @@ describe("Host utility functions", () => {
           if (key === "host") return "login-zitadel-qa.vercel.app";
           return null;
         }),
-      };
+      } as any;
 
-      vi.mocked(headers).mockResolvedValue(mockHeaders as any);
+      const result = getPublicHostWithProtocol(mockHeaders);
-
-      const result = await getOriginalHostWithProtocol();
       expect(result).toBe("https://zitadel.com");
     });
 
-    test("should handle CloudFlare proxy scenario", async () => {
+    test("should handle CloudFlare proxy scenario", () => {
-      const { headers } = await import("next/headers");
       const mockHeaders = {
         get: vi.fn((key: string) => {
           if (key === "x-forwarded-host") return "auth.company.com";
@@ -184,114 +119,180 @@ describe("Host utility functions", () => {
           if (key === "host") return "cloudflare-worker.workers.dev";
           return null;
         }),
-      };
+      } as any;
 
-      vi.mocked(headers).mockResolvedValue(mockHeaders as any);
+      const result = getPublicHost(mockHeaders);
-
-      const result = await getOriginalHost();
       expect(result).toBe("auth.company.com");
     });
 
-    test("should handle development environment", async () => {
+    test("should handle development environment", () => {
-      const { headers } = await import("next/headers");
       const mockHeaders = {
         get: vi.fn((key: string) => {
           if (key === "host") return "localhost:3000";
           return null;
         }),
-      };
+      } as any;
 
-      vi.mocked(headers).mockResolvedValue(mockHeaders as any);
+      const result = getPublicHostWithProtocol(mockHeaders);
-
-      const result = await getOriginalHostWithProtocol();
       expect(result).toBe("http://localhost:3000");
     });
 
-    test("should handle staging environment with subdomain", async () => {
+    test("should handle staging environment with subdomain", () => {
-      const { headers } = await import("next/headers");
       const mockHeaders = {
         get: vi.fn((key: string) => {
           if (key === "x-forwarded-host") return "staging-auth.company.com";
           if (key === "host") return "staging-internal.vercel.app";
           return null;
         }),
-      };
+      } as any;
 
-      vi.mocked(headers).mockResolvedValue(mockHeaders as any);
+      const result = getPublicHostWithProtocol(mockHeaders);
-
-      const result = await getOriginalHostWithProtocol();
       expect(result).toBe("https://staging-auth.company.com");
     });
+
+    test("should prioritize x-zitadel-instance-host in multi-tenant scenario", () => {
+      const mockHeaders = {
+        get: vi.fn((key: string) => {
+          if (key === "x-zitadel-instance-host") return "customer.zitadel.cloud";
+          if (key === "x-forwarded-host") return "accounts.company.com";
+          if (key === "host") return "internal.vercel.app";
+          return null;
+        }),
+      } as any;
+
+      const result = getInstanceHost(mockHeaders);
+      expect(result).toBe("customer.zitadel.cloud");
+    });
   });
 
   describe("Edge cases", () => {
-    test("should handle IPv4 addresses", async () => {
+    test("should handle IPv4 addresses", () => {
-      const { headers } = await import("next/headers");
       const mockHeaders = {
         get: vi.fn(() => "192.168.1.100:3000"),
-      };
+      } as any;
 
-      vi.mocked(headers).mockResolvedValue(mockHeaders as any);
+      const result = getPublicHostWithProtocol(mockHeaders);
-
-      const result = await getOriginalHostWithProtocol();
       expect(result).toBe("https://192.168.1.100:3000");
     });
 
-    test("should handle IPv6 addresses", async () => {
+    test("should handle IPv6 addresses", () => {
-      const { headers } = await import("next/headers");
       const mockHeaders = {
         get: vi.fn(() => "[::1]:3000"),
-      };
+      } as any;
 
-      vi.mocked(headers).mockResolvedValue(mockHeaders as any);
+      const result = getPublicHostWithProtocol(mockHeaders);
-
-      const result = await getOriginalHostWithProtocol();
       expect(result).toBe("https://[::1]:3000");
     });
 
-    test("should handle hosts with ports", async () => {
+    test("should handle hosts with ports", () => {
-      const { headers } = await import("next/headers");
       const mockHeaders = {
         get: vi.fn(() => "zitadel.com:8080"),
-      };
+      } as any;
 
-      vi.mocked(headers).mockResolvedValue(mockHeaders as any);
+      const result = getPublicHostWithProtocol(mockHeaders);
-
-      const result = await getOriginalHostWithProtocol();
       expect(result).toBe("https://zitadel.com:8080");
     });
 
-    test("should handle localhost with different ports", async () => {
+    test("should handle localhost with different ports", () => {
-      const { headers } = await import("next/headers");
       const mockHeaders = {
         get: vi.fn(() => "localhost:8080"),
-      };
+      } as any;
 
-      vi.mocked(headers).mockResolvedValue(mockHeaders as any);
+      const result = getPublicHostWithProtocol(mockHeaders);
-
-      const result = await getOriginalHostWithProtocol();
       expect(result).toBe("http://localhost:8080");
     });
+  });
 
-    test("should handle priority order correctly", async () => {
+  describe("getPublicHost", () => {
-      const { headers } = await import("next/headers");
+    test("should use x-zitadel-public-host when available", () => {
       const mockHeaders = {
         get: vi.fn((key: string) => {
-          // All headers are present, should return x-forwarded-host (highest priority)
+          if (key === "x-zitadel-public-host") return "public.zitadel.cloud";
-          if (key === "x-forwarded-host") return "priority1.com";
+          if (key === "x-forwarded-host") return "accounts.company.com";
-          if (key === "x-original-host") return "priority2.com";
-          if (key === "host") return "priority3.com";
           return null;
         }),
-      };
+      } as any;
 
-      vi.mocked(headers).mockResolvedValue(mockHeaders as any);
+      const result = getPublicHost(mockHeaders);
+      expect(result).toBe("public.zitadel.cloud");
+      expect(mockHeaders.get).toHaveBeenCalledWith("x-zitadel-public-host");
+    });
 
-      const result = await getOriginalHost();
+    test("should use x-zitadel-forward-host when x-zitadel-public-host is not available", () => {
-      expect(result).toBe("priority1.com");
+      const mockHeaders = {
-      // Should only call x-forwarded-host since it's available
+        get: vi.fn((key: string) => {
+          if (key === "x-zitadel-public-host") return null;
+          if (key === "x-zitadel-forward-host") return "forward.zitadel.cloud";
+          if (key === "x-forwarded-host") return "accounts.company.com";
+          return null;
+        }),
+      } as any;
+
+      const result = getPublicHost(mockHeaders);
+      expect(result).toBe("forward.zitadel.cloud");
+      expect(mockHeaders.get).toHaveBeenCalledWith("x-zitadel-public-host");
+      expect(mockHeaders.get).toHaveBeenCalledWith("x-zitadel-forward-host");
+    });
+
+    test("should use x-forwarded-host when neither x-zitadel-public-host nor x-zitadel-forward-host is available", () => {
+      const mockHeaders = {
+        get: vi.fn((key: string) => {
+          if (key === "x-zitadel-public-host") return null;
+          if (key === "x-zitadel-forward-host") return null;
+          if (key === "x-forwarded-host") return "accounts.company.com";
+          if (key === "host") return "internal.server";
+          return null;
+        }),
+      } as any;
+
+      const result = getPublicHost(mockHeaders);
+      expect(result).toBe("accounts.company.com");
+      expect(mockHeaders.get).toHaveBeenCalledWith("x-zitadel-public-host");
+      expect(mockHeaders.get).toHaveBeenCalledWith("x-zitadel-forward-host");
       expect(mockHeaders.get).toHaveBeenCalledWith("x-forwarded-host");
-      expect(mockHeaders.get).toHaveBeenCalledTimes(1);
+    });
+
+    test("should fall back to host when x-forwarded-host is not available", () => {
+      const mockHeaders = {
+        get: vi.fn((key: string) => {
+          if (key === "x-zitadel-public-host") return null;
+          if (key === "x-zitadel-forward-host") return null;
+          if (key === "x-forwarded-host") return null;
+          if (key === "host") return "localhost:3000";
+          return null;
+        }),
+      } as any;
+
+      const result = getPublicHost(mockHeaders);
+      expect(result).toBe("localhost:3000");
+      expect(mockHeaders.get).toHaveBeenCalledWith("x-forwarded-host");
+      expect(mockHeaders.get).toHaveBeenCalledWith("host");
+    });
+
+    test("should throw error when no host is found", () => {
+      const mockHeaders = {
+        get: vi.fn(() => null),
+      } as any;
+
+      expect(() => getPublicHost(mockHeaders)).toThrow("No host found in headers");
+    });
+
+    test("should differ from getInstanceHost when x-zitadel-instance-host is present", () => {
+      const mockHeaders = {
+        get: vi.fn((key: string) => {
+          if (key === "x-zitadel-instance-host") return "instance.zitadel.cloud";
+          if (key === "x-forwarded-host") return "accounts.company.com";
+          if (key === "host") return "internal.server";
+          return null;
+        }),
+      } as any;
+
+      const instanceHost = getInstanceHost(mockHeaders);
+      const publicHost = getPublicHost(mockHeaders);
+
+      expect(instanceHost).toBe("instance.zitadel.cloud");
+      expect(publicHost).toBe("accounts.company.com");
+      expect(instanceHost).not.toBe(publicHost);
     });
   });
 });

apps/login/src/lib/server/host.ts

@@ -1,48 +1,48 @@
-import { headers } from "next/headers";
+import { ReadonlyHeaders } from "next/dist/server/web/spec-extension/adapters/headers";
 
 /**
  * Gets the original host that the user sees in their browser URL.
  * When using rewrites this function prioritizes forwarded headers that preserve the original host.
  *
- * ⚠️ SERVER-SIDE ONLY: This function can only be used in:
- * - Server Actions (functions with "use server")
- * - Server Components (React components that run on the server)
- * - Route Handlers (API routes)
- * - Middleware
- *
  * @returns The host string (e.g., "zitadel.com")
  * @throws Error if no host is found
  */
-export async function getOriginalHost(): Promise<string> {
+export function getInstanceHost(headers: ReadonlyHeaders): string | null {
-  const _headers = await headers();
+  // use standard proxy headers (x-forwarded-host → host) for both multi-tenant and self-hosted, do not use x-zitadel-instance-host
+  const instanceHost = headers.get("x-zitadel-instance-host") || headers.get("x-zitadel-forward-host");
 
-  // Priority order:
+  return instanceHost;
-  // 1. x-forwarded-host - Set by proxies/CDNs with the original host
-  // 2. x-original-host - Alternative header sometimes used
-  // 3. host - Fallback to the current host header
-  const host = _headers.get("x-forwarded-host") || _headers.get("x-original-host") || _headers.get("host");
-
-  if (!host || typeof host !== "string") {
-    throw new Error("No host found in headers");
-  }
-
-  return host;
 }
 
 /**
- * Gets the original host with protocol prefix.
+ * Gets the public host that the user sees in their browser URL.
- * Automatically detects if localhost should use http:// or https://
+ * Only considers standard proxy headers (x-forwarded-host and host).
+ * Does NOT include x-zitadel-instance-host.
  *
- * ⚠️ SERVER-SIDE ONLY: This function can only be used in:
+ * Use this when you need the public-facing host that the user actually sees,
- * - Server Actions (functions with "use server")
+ * not the internal instance host used for API routing.
- * - Server Components (React components that run on the server)
- * - Route Handlers (API routes)
- * - Middleware
  *
- * @returns The full URL prefix (e.g., "https://zitadel.com")
+ * @returns The public host string (e.g., "accounts.company.com")
+ * @throws Error if no host is found
  */
-export async function getOriginalHostWithProtocol(): Promise<string> {
+export function getPublicHost(headers: ReadonlyHeaders): string {
-  const host = await getOriginalHost();
+  // Only use standard proxy headers (x-zitadel-public-host → x-zitadel-forward-host → x-forwarded-host → host)
+  // Do NOT use x-zitadel-instance-host as it may differ from what the user sees
+  const publicHost =
+    headers.get("x-zitadel-public-host") ||
+    headers.get("x-zitadel-forward-host") ||
+    headers.get("x-forwarded-host") ||
+    headers.get("host");
+
+  if (!publicHost || typeof publicHost !== "string") {
+    throw new Error("No host found in headers");
+  }
+
+  return publicHost;
+}
+
+export function getPublicHostWithProtocol(headers: ReadonlyHeaders): string {
+  const host = getPublicHost(headers);
   const protocol = host.includes("localhost") ? "http://" : "https://";
   return `${protocol}${host}`;
 }

apps/login/src/lib/server/idp-intent.test.ts

@@ -12,7 +12,7 @@ vi.mock("@zitadel/client", () => ({
 }));
 
 vi.mock("../service-url", () => ({
-  getServiceUrlFromHeaders: vi.fn(),
+  getServiceConfig: vi.fn(),
 }));
 
 vi.mock("../zitadel", () => ({
@@ -111,7 +111,7 @@ describe("processIDPCallback", () => {
 
     // Import mocked modules
     const { headers } = await import("next/headers");
-    const { getServiceUrlFromHeaders } = await import("../service-url");
+    const { getServiceConfig } = await import("../service-url");
     const {
       retrieveIDPIntent,
       getIDPByID,
@@ -129,7 +129,7 @@ describe("processIDPCallback", () => {
 
     // Setup mocks
     mockHeaders = vi.mocked(headers);
-    mockGetServiceUrlFromHeaders = vi.mocked(getServiceUrlFromHeaders);
+    mockGetServiceUrlFromHeaders = vi.mocked(getServiceConfig);
     mockRetrieveIDPIntent = vi.mocked(retrieveIDPIntent);
     mockGetIDPByID = vi.mocked(getIDPByID);
     mockUpdateHuman = vi.mocked(updateHuman);
@@ -146,7 +146,7 @@ describe("processIDPCallback", () => {
     // Default mock implementations
     mockHeaders.mockResolvedValue({} as any);
     mockGetServiceUrlFromHeaders.mockReturnValue({
-      serviceUrl: "https://api.example.com",
+      serviceConfig: { baseUrl: "https://api.example.com" },
     });
     mockRetrieveIDPIntent.mockResolvedValue(defaultIntent);
     mockGetIDPByID.mockResolvedValue(defaultIdp);
@@ -257,7 +257,7 @@ describe("processIDPCallback", () => {
       const result = await processIDPCallback(defaultParams);
 
       expect(mockRetrieveIDPIntent).toHaveBeenCalledWith({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         id: "intent123",
         token: "token123",
       });
@@ -287,7 +287,7 @@ describe("processIDPCallback", () => {
       await processIDPCallback(defaultParams);
 
       expect(mockUpdateHuman).toHaveBeenCalledWith({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         request: expect.objectContaining({
           userId: "user123",
           profile: defaultIntent.updateHumanUser.profile,
@@ -353,7 +353,7 @@ describe("processIDPCallback", () => {
       const result = await processIDPCallback(linkParams);
 
       expect(mockAddIDPLink).toHaveBeenCalledWith({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         idp: {
           id: "idp123",
           userId: "user123",
@@ -442,12 +442,12 @@ describe("processIDPCallback", () => {
       const result = await processIDPCallback(defaultParams);
 
       expect(mockListUsers).toHaveBeenCalledWith({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         email: "[email protected]",
         organizationId: "org123",
       });
       expect(mockAddIDPLink).toHaveBeenCalledWith({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         idp: {
           id: "idp123",
           userId: "user123",
@@ -523,7 +523,7 @@ describe("processIDPCallback", () => {
       const result = await processIDPCallback(defaultParams);
 
       expect(mockListUsers).toHaveBeenCalledWith({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         userName: "testuser",
         organizationId: "org123",
       });
@@ -557,7 +557,7 @@ describe("processIDPCallback", () => {
       const result = await processIDPCallback(defaultParams);
 
       expect(mockAddHuman).toHaveBeenCalledWith({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         request: expect.objectContaining({
           username: "testuser",
           profile: defaultIntent.addHumanUser.profile,
@@ -602,11 +602,11 @@ describe("processIDPCallback", () => {
       });
 
       expect(mockGetOrgsByDomain).toHaveBeenCalledWith({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         domain: "example.com",
       });
       expect(mockAddHuman).toHaveBeenCalledWith({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         request: expect.objectContaining({
           organization: expect.objectContaining({
             org: { case: "orgId", value: "org-from-domain" },
@@ -625,10 +625,10 @@ describe("processIDPCallback", () => {
       });
 
       expect(mockGetDefaultOrg).toHaveBeenCalledWith({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
       });
       expect(mockAddHuman).toHaveBeenCalledWith({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         request: expect.objectContaining({
           organization: expect.objectContaining({
             org: { case: "orgId", value: "default-org" },
@@ -901,14 +901,14 @@ describe("validateIDPLinkingPermissions", () => {
       });
 
       const result = await validateIDPLinkingPermissions({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         userOrganizationId: "org123",
         idpId: "idp123",
       });
 
       expect(result).toBe(false);
       expect(mockGetLoginSettings).toHaveBeenCalledWith({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         organization: "org123",
       });
       expect(mockGetActiveIdentityProviders).not.toHaveBeenCalled();
@@ -918,7 +918,7 @@ describe("validateIDPLinkingPermissions", () => {
       mockGetLoginSettings.mockResolvedValue(undefined);
 
       const result = await validateIDPLinkingPermissions({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         userOrganizationId: "org123",
         idpId: "idp123",
       });
@@ -930,7 +930,7 @@ describe("validateIDPLinkingPermissions", () => {
       mockGetLoginSettings.mockResolvedValue({});
 
       const result = await validateIDPLinkingPermissions({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         userOrganizationId: "org123",
         idpId: "idp123",
       });
@@ -952,14 +952,14 @@ describe("validateIDPLinkingPermissions", () => {
       });
 
       const result = await validateIDPLinkingPermissions({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         userOrganizationId: "org123",
         idpId: "idp123",
       });
 
       expect(result).toBe(false);
       expect(mockGetActiveIdentityProviders).toHaveBeenCalledWith({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         orgId: "org123",
         linking_allowed: true,
       });
@@ -974,7 +974,7 @@ describe("validateIDPLinkingPermissions", () => {
       });
 
       const result = await validateIDPLinkingPermissions({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         userOrganizationId: "org123",
         idpId: "idp123",
       });
@@ -989,7 +989,7 @@ describe("validateIDPLinkingPermissions", () => {
       mockGetActiveIdentityProviders.mockResolvedValue({});
 
       const result = await validateIDPLinkingPermissions({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         userOrganizationId: "org123",
         idpId: "idp123",
       });
@@ -1011,18 +1011,18 @@ describe("validateIDPLinkingPermissions", () => {
       });
 
       const result = await validateIDPLinkingPermissions({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         userOrganizationId: "org123",
         idpId: "idp123",
       });
 
       expect(result).toBe(true);
       expect(mockGetLoginSettings).toHaveBeenCalledWith({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         organization: "org123",
       });
       expect(mockGetActiveIdentityProviders).toHaveBeenCalledWith({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         orgId: "org123",
         linking_allowed: true,
       });
@@ -1042,7 +1042,7 @@ describe("validateIDPLinkingPermissions", () => {
       });
 
       const result = await validateIDPLinkingPermissions({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         userOrganizationId: "org123",
         idpId: "idp123",
       });
@@ -1057,7 +1057,7 @@ describe("validateIDPLinkingPermissions", () => {
 
       await expect(
         validateIDPLinkingPermissions({
-          serviceUrl: "https://api.example.com",
+          serviceConfig: { baseUrl: "https://api.example.com" },
           userOrganizationId: "org123",
           idpId: "idp123",
         }),
@@ -1072,7 +1072,7 @@ describe("validateIDPLinkingPermissions", () => {
 
       await expect(
         validateIDPLinkingPermissions({
-          serviceUrl: "https://api.example.com",
+          serviceConfig: { baseUrl: "https://api.example.com" },
           userOrganizationId: "org123",
           idpId: "idp123",
         }),
@@ -1088,7 +1088,7 @@ describe("validateIDPLinkingPermissions", () => {
       });
 
       const result = await validateIDPLinkingPermissions({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         userOrganizationId: "org123",
         idpId: "idp123",
       });

apps/login/src/lib/server/idp-intent.ts

@@ -1,6 +1,6 @@
 "use server";
 
-import { getServiceUrlFromHeaders } from "@/lib/service-url";
+import { getServiceConfig } from "@/lib/service-url";
 import {
   retrieveIDPIntent,
   getIDPByID,
@@ -13,6 +13,7 @@ import {
   getActiveIdentityProviders,
   getUserByID,
   getDefaultOrg,
+  ServiceConfig,
 } from "@/lib/zitadel";
 import { headers } from "next/headers";
 import { create } from "@zitadel/client";
@@ -31,11 +32,11 @@ const ORG_SUFFIX_REGEX = /(?<=@)(.+)/;
 async function resolveOrganizationForUser({
   organization,
   addHumanUser,
-  serviceUrl,
+  serviceConfig,
 }: {
   organization?: string;
   addHumanUser?: AddHumanUserRequest;
-  serviceUrl: string;
+  serviceConfig: ServiceConfig;
 }): Promise<string | undefined> {
   if (organization) return organization;
 
@@ -43,16 +44,12 @@ async function resolveOrganizationForUser({
     const matched = ORG_SUFFIX_REGEX.exec(addHumanUser.username);
     const suffix = matched?.[1] ?? "";
 
-    const orgs = await getOrgsByDomain({
+    const orgs = await getOrgsByDomain({ serviceConfig, domain: suffix,
-      serviceUrl,
-      domain: suffix,
     });
     const orgToCheckForDiscovery = orgs.result && orgs.result.length === 1 ? orgs.result[0].id : undefined;
 
     if (orgToCheckForDiscovery) {
-      const orgLoginSettings = await getLoginSettings({
+      const orgLoginSettings = await getLoginSettings({ serviceConfig, organization: orgToCheckForDiscovery,
-        serviceUrl,
-        organization: orgToCheckForDiscovery,
       });
       if (orgLoginSettings?.allowDomainDiscovery) {
         return orgToCheckForDiscovery;
@@ -61,7 +58,7 @@ async function resolveOrganizationForUser({
   }
 
   // Fallback to default organization if no org was resolved through discovery
-  const defaultOrg = await getDefaultOrg({ serviceUrl });
+  const defaultOrg = await getDefaultOrg({ serviceConfig });
   return defaultOrg?.id;
 }
 
@@ -72,19 +69,15 @@ async function resolveOrganizationForUser({
  * 2. The specific IDP is activated for the organization
  *
  */
-export async function validateIDPLinkingPermissions({
+export async function validateIDPLinkingPermissions({ serviceConfig, userOrganizationId,
-  serviceUrl,
-  userOrganizationId,
   idpId,
 }: {
-  serviceUrl: string;
+  serviceConfig: ServiceConfig;
   userOrganizationId: string;
   idpId: string;
 }): Promise<boolean> {
   // Check organization login settings
-  const loginSettings = await getLoginSettings({
+  const loginSettings = await getLoginSettings({ serviceConfig, organization: userOrganizationId,
-    serviceUrl,
-    organization: userOrganizationId,
   });
 
   if (!loginSettings?.allowExternalIdp) {
@@ -92,9 +85,7 @@ export async function validateIDPLinkingPermissions({
   }
 
   // Check if the IDP is activated for the organization and allows linking
-  const activeIDPs = await getActiveIdentityProviders({
+  const activeIDPs = await getActiveIdentityProviders({ serviceConfig, orgId: userOrganizationId,
-    serviceUrl,
-    orgId: userOrganizationId,
     linking_allowed: true,
   });
 
@@ -132,7 +123,7 @@ export async function processIDPCallback({
   postErrorRedirectUrl?: string;
 }): Promise<{ redirect?: string; error?: string }> {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   const t = await getTranslations("idp");
 
@@ -155,9 +146,7 @@ export async function processIDPCallback({
     });
 
     // Consume the single-use token ONCE
-    const intent = await retrieveIDPIntent({
+    const intent = await retrieveIDPIntent({ serviceConfig, id,
-      serviceUrl,
-      id,
       token,
     });
 
@@ -171,9 +160,7 @@ export async function processIDPCallback({
     }
 
     // Get IDP configuration
-    const idp = await getIDPByID({
+    const idp = await getIDPByID({ serviceConfig, id: idpInformation.idpId,
-      serviceUrl,
-      id: idpInformation.idpId,
     });
 
     if (!idp) {
@@ -207,9 +194,7 @@ export async function processIDPCallback({
       // Auto-update user if enabled
       if (options?.isAutoUpdate && updateHumanUser) {
         try {
-          await updateHuman({
+          await updateHuman({ serviceConfig, request: create(UpdateHumanUserRequestSchema, {
-            serviceUrl,
-            request: create(UpdateHumanUserRequestSchema, {
               userId: userId,
               profile: updateHumanUser.profile,
               email: updateHumanUser.email,
@@ -259,7 +244,7 @@ export async function processIDPCallback({
 
       try {
         // Get user to retrieve their organization
-        const targetUser = await getUserByID({ serviceUrl, userId });
+        const targetUser = await getUserByID({ serviceConfig, userId });
 
         if (!targetUser || !targetUser.details?.resourceOwner) {
           console.error("[IDP Process] User not found or missing organization");
@@ -268,9 +253,7 @@ export async function processIDPCallback({
         }
 
         // Validate IDP linking permissions
-        const isAllowed = await validateIDPLinkingPermissions({
+        const isAllowed = await validateIDPLinkingPermissions({ serviceConfig, userOrganizationId: targetUser.details.resourceOwner,
-          serviceUrl,
-          userOrganizationId: targetUser.details.resourceOwner,
           idpId: idpInformation.idpId,
         });
 
@@ -280,9 +263,7 @@ export async function processIDPCallback({
           return { redirect: `/idp/${provider}/linking-failed?${params}&error=validation_failed` };
         }
 
-        await addIDPLink({
+        await addIDPLink({ serviceConfig, idp: {
-          serviceUrl,
-          idp: {
             id: idpInformation.idpId,
             userId: idpInformation.userId,
             userName: idpInformation.userName,
@@ -328,21 +309,17 @@ export async function processIDPCallback({
       const email = addHumanUser?.email?.email;
 
       if (options.autoLinking === AutoLinkingOption.EMAIL && email) {
-        foundUser = await listUsers({ serviceUrl, email, organizationId: organization }).then((response) => {
+        foundUser = await listUsers({ serviceConfig, email, organizationId: organization }).then((response) => {
           return response.result ? response.result[0] : null;
         });
       } else if (options.autoLinking === AutoLinkingOption.USERNAME) {
-        foundUser = await listUsers({
+        foundUser = await listUsers({ serviceConfig, userName: idpInformation.userName,
-          serviceUrl,
-          userName: idpInformation.userName,
           organizationId: organization,
         }).then((response) => {
           return response.result ? response.result[0] : null;
         });
       } else {
-        foundUser = await listUsers({
+        foundUser = await listUsers({ serviceConfig, userName: idpInformation.userName,
-          serviceUrl,
-          userName: idpInformation.userName,
           email,
           organizationId: organization,
         }).then((response) => {
@@ -359,9 +336,7 @@ export async function processIDPCallback({
           }
 
           // Validate IDP linking permissions
-          const isAllowed = await validateIDPLinkingPermissions({
+          const isAllowed = await validateIDPLinkingPermissions({ serviceConfig, userOrganizationId: foundUser.details.resourceOwner,
-            serviceUrl,
-            userOrganizationId: foundUser.details.resourceOwner,
             idpId: idpInformation.idpId,
           });
 
@@ -371,9 +346,7 @@ export async function processIDPCallback({
             return { redirect: `/idp/${provider}/linking-failed?${params}&error=validation_failed` };
           }
 
-          await addIDPLink({
+          await addIDPLink({ serviceConfig, idp: {
-            serviceUrl,
-            idp: {
               id: idpInformation.idpId,
               userId: idpInformation.userId,
               userName: idpInformation.userName,
@@ -419,7 +392,7 @@ export async function processIDPCallback({
       const orgToRegisterOn = await resolveOrganizationForUser({
         organization,
         addHumanUser,
-        serviceUrl,
+        serviceConfig,
       });
 
       if (!orgToRegisterOn) {
@@ -438,9 +411,7 @@ export async function processIDPCallback({
       });
 
       try {
-        const newUser = await addHuman({
+        const newUser = await addHuman({ serviceConfig, request: addHumanUserWithOrganization,
-          serviceUrl,
-          request: addHumanUserWithOrganization,
         });
         console.log("[IDP Process] User auto-created successfully, creating session");
 
@@ -480,7 +451,7 @@ export async function processIDPCallback({
       const orgToRegisterOn = await resolveOrganizationForUser({
         organization,
         addHumanUser,
-        serviceUrl,
+        serviceConfig,
       });
 
       if (!orgToRegisterOn) {

apps/login/src/lib/server/idp.test.ts

@@ -13,11 +13,12 @@ vi.mock("next/navigation", () => ({
 }));
 
 vi.mock("../service-url", () => ({
-  getServiceUrlFromHeaders: vi.fn(),
+  getServiceConfig: vi.fn(),
 }));
 
 vi.mock("./host", () => ({
-  getOriginalHost: vi.fn(),
+  getInstanceHost: vi.fn(),
+  getPublicHost: vi.fn(),
 }));
 
 vi.mock("../zitadel", () => ({
@@ -27,7 +28,8 @@ vi.mock("../zitadel", () => ({
 describe("redirectToIdp", () => {
   let mockHeaders: any;
   let mockGetServiceUrlFromHeaders: any;
-  let mockGetOriginalHost: any;
+  let mockGetInstanceHost: any;
+  let mockGetPublicHost: any;
   let mockStartIdentityProviderFlow: any;
 
   beforeEach(async () => {
@@ -35,22 +37,24 @@ describe("redirectToIdp", () => {
 
     // Import mocked modules
     const { headers } = await import("next/headers");
-    const { getServiceUrlFromHeaders } = await import("../service-url");
+    const { getServiceConfig } = await import("../service-url");
-    const { getOriginalHost } = await import("./host");
+    const { getInstanceHost, getPublicHost } = await import("./host");
     const { startIdentityProviderFlow } = await import("../zitadel");
 
     // Setup mocks
     mockHeaders = vi.mocked(headers);
-    mockGetServiceUrlFromHeaders = vi.mocked(getServiceUrlFromHeaders);
+    mockGetServiceUrlFromHeaders = vi.mocked(getServiceConfig);
-    mockGetOriginalHost = vi.mocked(getOriginalHost);
+    mockGetInstanceHost = vi.mocked(getInstanceHost);
+    mockGetPublicHost = vi.mocked(getPublicHost);
     mockStartIdentityProviderFlow = vi.mocked(startIdentityProviderFlow);
 
     // Default mock implementations
     mockHeaders.mockResolvedValue({} as any);
     mockGetServiceUrlFromHeaders.mockReturnValue({
-      serviceUrl: "https://api.example.com",
+      serviceConfig: { baseUrl: "https://api.example.com" },
     });
-    mockGetOriginalHost.mockResolvedValue("example.com");
+    mockGetInstanceHost.mockReturnValue("example.com");
+    mockGetPublicHost.mockReturnValue("example.com");
   });
 
   afterEach(() => {
@@ -76,7 +80,7 @@ describe("redirectToIdp", () => {
       }
 
       expect(mockStartIdentityProviderFlow).toHaveBeenCalledWith({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         idpId: "idp123",
         urls: {
           successUrl: expect.stringContaining("postErrorRedirectUrl=https%3A%2F%2Fapp.example.com%2Ferror"),
@@ -115,7 +119,7 @@ describe("redirectToIdp", () => {
       }
 
       expect(mockStartIdentityProviderFlow).toHaveBeenCalledWith({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         idpId: "idp123",
         urls: {
           successUrl: expect.not.stringContaining("postErrorRedirectUrl"),

apps/login/src/lib/server/idp.ts

@@ -6,21 +6,22 @@ import {
   listAuthenticationMethodTypes,
   startIdentityProviderFlow,
   startLDAPIdentityProviderFlow,
+  ServiceConfig,
 } from "@/lib/zitadel";
 import { headers } from "next/headers";
 import { redirect } from "next/navigation";
 import { completeFlowOrGetUrl } from "../client";
-import { getServiceUrlFromHeaders } from "../service-url";
+import { getServiceConfig } from "../service-url";
 import { checkEmailVerification, checkMFAFactors } from "../verify-helper";
 import { createSessionForIdpAndUpdateCookie } from "./cookie";
-import { getOriginalHost } from "./host";
+import { getPublicHost } from "./host";
 
 export type RedirectToIdpState = { error?: string | null } | undefined;
 
 export async function redirectToIdp(prevState: RedirectToIdpState, formData: FormData): Promise<RedirectToIdpState> {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
-  const host = await getOriginalHost();
+  const host = getPublicHost(_headers);
 
   const params = new URLSearchParams();
 
@@ -43,7 +44,7 @@ export async function redirectToIdp(prevState: RedirectToIdpState, formData: For
   }
 
   const response = await startIDPFlow({
-    serviceUrl,
+    serviceConfig,
     host,
     idpId,
     successUrl: `/idp/${provider}/process?` + params.toString(),
@@ -62,7 +63,7 @@ export async function redirectToIdp(prevState: RedirectToIdpState, formData: For
 }
 
 export type StartIDPFlowCommand = {
-  serviceUrl: string;
+  serviceConfig: ServiceConfig;
   host: string;
   idpId: string;
   successUrl: string;
@@ -73,7 +74,7 @@ async function startIDPFlow(command: StartIDPFlowCommand) {
   const basePath = process.env.NEXT_PUBLIC_BASE_PATH ?? "";
 
   const url = await startIdentityProviderFlow({
-    serviceUrl: command.serviceUrl,
+    serviceConfig: command.serviceConfig,
     idpId: command.idpId,
     urls: {
       successUrl: `${command.host.includes("localhost") ? "http://" : "https://"}${command.host}${basePath}${command.successUrl}`,
@@ -103,25 +104,19 @@ export type CreateNewSessionCommand = {
 export async function createNewSessionFromIdpIntent(command: CreateNewSessionCommand) {
   const _headers = await headers();
 
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   if (!command.userId || !command.idpIntent) {
     throw new Error("No userId or loginName provided");
   }
 
-  const userResponse = await getUserByID({
+  const userResponse = await getUserByID({ serviceConfig, userId: command.userId });
-    serviceUrl,
-    userId: command.userId,
-  });
 
   if (!userResponse || !userResponse.user) {
     return { error: "User not found in the system" };
   }
 
-  const loginSettings = await getLoginSettings({
+  const loginSettings = await getLoginSettings({ serviceConfig, organization: userResponse.user.details?.resourceOwner });
-    serviceUrl,
-    organization: userResponse.user.details?.resourceOwner,
-  });
 
   const session = await createSessionForIdpAndUpdateCookie({
     userId: command.userId,
@@ -146,17 +141,14 @@ export async function createNewSessionFromIdpIntent(command: CreateNewSessionCom
   // check if user has MFA methods
   let authMethods;
   if (session.factors?.user?.id) {
-    const response = await listAuthenticationMethodTypes({
+    const response = await listAuthenticationMethodTypes({ serviceConfig, userId: session.factors.user.id });
-      serviceUrl,
-      userId: session.factors.user.id,
-    });
     if (response.authMethodTypes && response.authMethodTypes.length) {
       authMethods = response.authMethodTypes;
     }
   }
 
   const mfaFactorCheck = await checkMFAFactors(
-    serviceUrl,
+    serviceConfig,
     session,
     loginSettings,
     authMethods || [], // Pass empty array if no auth methods
@@ -193,14 +185,14 @@ type createNewSessionForLDAPCommand = {
 export async function createNewSessionForLDAP(command: createNewSessionForLDAPCommand) {
   const _headers = await headers();
 
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   if (!command.username || !command.password) {
     return { error: "No username or password provided" };
   }
 
   const response = await startLDAPIdentityProviderFlow({
-    serviceUrl,
+    serviceConfig,
     idpId: command.idpId,
     username: command.username,
     password: command.password,

apps/login/src/lib/server/loginname.test.ts

@@ -15,7 +15,7 @@ vi.mock("@zitadel/client", () => ({
 }));
 
 vi.mock("../service-url", () => ({
-  getServiceUrlFromHeaders: vi.fn(),
+  getServiceConfig: vi.fn(),
 }));
 
 vi.mock("../idp", () => ({
@@ -39,7 +39,8 @@ vi.mock("./cookie", () => ({
 }));
 
 vi.mock("./host", () => ({
-  getOriginalHost: vi.fn(),
+  getInstanceHost: vi.fn(),
+  getPublicHost: vi.fn(),
 }));
 
 // this returns the key itself that can be checked not the translated value
@@ -57,7 +58,8 @@ describe("sendLoginname", () => {
   let mockCreateSessionAndUpdateCookie: any;
   let mockListAuthenticationMethodTypes: any;
   let mockListIDPLinks: any;
-  let mockGetOriginalHost: any;
+  let mockGetInstanceHost: any;
+  let mockGetPublicHost: any;
   let mockStartIdentityProviderFlow: any;
   let mockGetActiveIdentityProviders: any;
   let mockGetIDPByID: any;
@@ -70,7 +72,7 @@ describe("sendLoginname", () => {
     // Import mocked modules
     const { headers } = await import("next/headers");
     const { create } = await import("@zitadel/client");
-    const { getServiceUrlFromHeaders } = await import("../service-url");
+    const { getServiceConfig } = await import("../service-url");
     const {
       getLoginSettings,
       searchUsers,
@@ -81,19 +83,20 @@ describe("sendLoginname", () => {
       getOrgsByDomain,
     } = await import("../zitadel");
     const { createSessionAndUpdateCookie } = await import("./cookie");
-    const { getOriginalHost } = await import("./host");
+    const { getInstanceHost, getPublicHost } = await import("./host");
     const { idpTypeToSlug } = await import("../idp");
 
     // Setup mocks
     mockHeaders = vi.mocked(headers);
     mockCreate = vi.mocked(create);
-    mockGetServiceUrlFromHeaders = vi.mocked(getServiceUrlFromHeaders);
+    mockGetServiceUrlFromHeaders = vi.mocked(getServiceConfig);
     mockGetLoginSettings = vi.mocked(getLoginSettings);
     mockSearchUsers = vi.mocked(searchUsers);
     mockCreateSessionAndUpdateCookie = vi.mocked(createSessionAndUpdateCookie);
     mockListAuthenticationMethodTypes = vi.mocked(listAuthenticationMethodTypes);
     mockListIDPLinks = vi.mocked(listIDPLinks);
-    mockGetOriginalHost = vi.mocked(getOriginalHost);
+    mockGetInstanceHost = vi.mocked(getInstanceHost);
+    mockGetPublicHost = vi.mocked(getPublicHost);
     mockStartIdentityProviderFlow = vi.mocked(startIdentityProviderFlow);
     mockGetActiveIdentityProviders = vi.mocked(getActiveIdentityProviders);
     mockGetIDPByID = vi.mocked(getIDPByID);
@@ -102,8 +105,9 @@ describe("sendLoginname", () => {
 
     // Default mock implementations
     mockHeaders.mockResolvedValue({} as any);
-    mockGetServiceUrlFromHeaders.mockReturnValue({ serviceUrl: "https://api.example.com" });
+    mockGetServiceUrlFromHeaders.mockReturnValue({ serviceConfig: { baseUrl: "https://api.example.com" } });
-    mockGetOriginalHost.mockResolvedValue("example.com");
+    mockGetInstanceHost.mockReturnValue("example.com");
+    mockGetPublicHost.mockReturnValue("example.com");
     mockIdpTypeToSlug.mockReturnValue("google");
     mockGetIDPByID.mockResolvedValue({
       id: "idp123",
@@ -243,7 +247,7 @@ describe("sendLoginname", () => {
 
         expect(result).toEqual({ redirect: "https://idp.example.com/auth" });
         expect(mockListIDPLinks).toHaveBeenCalledWith({
-          serviceUrl: "https://api.example.com",
+          serviceConfig: { baseUrl: "https://api.example.com" },
           userId: "user123",
         });
       });
@@ -283,7 +287,7 @@ describe("sendLoginname", () => {
 
         expect(result).toEqual({ redirect: "https://org-idp.example.com/auth" });
         expect(mockGetActiveIdentityProviders).toHaveBeenCalledWith({
-          serviceUrl: "https://api.example.com",
+          serviceConfig: { baseUrl: "https://api.example.com" },
           orgId: "org123", // User's organization from resourceOwner
         });
       });
@@ -523,7 +527,7 @@ describe("sendLoginname", () => {
 
       // Verify org discovery was called with correct domain
       expect(mockGetOrgsByDomain).toHaveBeenCalledWith({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         domain: "example.com",
       });
     });
@@ -562,13 +566,13 @@ describe("sendLoginname", () => {
 
       // Verify org discovery was called
       expect(mockGetOrgsByDomain).toHaveBeenCalledWith({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         domain: "company.com",
       });
 
       // Verify IDP redirect was called with discovered org
       expect(mockGetActiveIdentityProviders).toHaveBeenCalledWith({
-        serviceUrl: "https://api.example.com",
+        serviceConfig: { baseUrl: "https://api.example.com" },
         orgId: "discovered-org-456",
       });
     });

apps/login/src/lib/server/loginname.ts

@@ -9,7 +9,7 @@ import { idpTypeToIdentityProviderType, idpTypeToSlug } from "../idp";
 
 import { PasskeysType } from "@zitadel/proto/zitadel/settings/v2/login_settings_pb";
 import { UserState } from "@zitadel/proto/zitadel/user/v2/user_pb";
-import { getServiceUrlFromHeaders } from "../service-url";
+import { getServiceConfig } from "../service-url";
 import {
   getActiveIdentityProviders,
   getIDPByID,
@@ -22,7 +22,7 @@ import {
   startIdentityProviderFlow,
 } from "../zitadel";
 import { createSessionAndUpdateCookie } from "./cookie";
-import { getOriginalHost } from "./host";
+import { getPublicHost } from "./host";
 import { IDPLink } from "@zitadel/proto/zitadel/user/v2/idp_pb";
 
 export type SendLoginnameCommand = {
@@ -36,21 +36,18 @@ const ORG_SUFFIX_REGEX = /(?<=@)(.+)/;
 
 export async function sendLoginname(command: SendLoginnameCommand) {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   const t = await getTranslations("loginname");
 
-  const loginSettingsByContext = await getLoginSettings({
+  const loginSettingsByContext = await getLoginSettings({ serviceConfig, organization: command.organization });
-    serviceUrl,
-    organization: command.organization,
-  });
 
   if (!loginSettingsByContext) {
     return { error: t("errors.couldNotGetLoginSettings") };
   }
 
   let searchUsersRequest: SearchUsersCommand = {
-    serviceUrl,
+    serviceConfig,
     searchValue: command.loginName,
     organizationId: command.organization,
     loginSettings: loginSettingsByContext,
@@ -88,28 +85,22 @@ export async function sendLoginname(command: SendLoginnameCommand) {
     // If userId is provided, check for user-specific IDP links first
     let identityProviders: IDPLink[] = [];
     if (userId) {
-      identityProviders = await listIDPLinks({
+      identityProviders = await listIDPLinks({ serviceConfig, userId }).then((resp) => {
-        serviceUrl,
-        userId,
-      }).then((resp) => {
         return resp.result;
       });
     }
 
     // If no IDP links exist for the user (or no userId provided), try to get active IDPs from the organization
     if (identityProviders.length === 0) {
-      const activeIdps = await getActiveIdentityProviders({
+      const activeIdps = await getActiveIdentityProviders({ serviceConfig, orgId: organization }).then((resp) => {
-        serviceUrl,
-        orgId: organization,
-      }).then((resp) => {
         return resp.identityProviders;
       });
 
       // If exactly one active IDP exists in the organization, redirect to it
       if (activeIdps.length === 1) {
         const _headers = await headers();
-        const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+        const { serviceConfig } = getServiceConfig(_headers);
-        const host = await getOriginalHost();
+        const host = getPublicHost(_headers);
 
         const identityProviderType = activeIdps[0].type;
         const provider = idpTypeToSlug(identityProviderType);
@@ -131,7 +122,7 @@ export async function sendLoginname(command: SendLoginnameCommand) {
         const basePath = process.env.NEXT_PUBLIC_BASE_PATH ?? "";
 
         const url = await startIdentityProviderFlow({
-          serviceUrl,
+          serviceConfig,
           idpId: activeIdps[0].id,
           urls: {
             successUrl:
@@ -153,15 +144,12 @@ export async function sendLoginname(command: SendLoginnameCommand) {
 
     if (identityProviders.length === 1) {
       const _headers = await headers();
-      const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+      const { serviceConfig } = getServiceConfig(_headers);
-      const host = await getOriginalHost();
+      const host = getPublicHost(_headers);
 
       const identityProviderId = identityProviders[0].idpId;
 
-      const idp = await getIDPByID({
+      const idp = await getIDPByID({ serviceConfig, id: identityProviderId });
-        serviceUrl,
-        id: identityProviderId,
-      });
 
       const idpType = idp?.type;
 
@@ -189,7 +177,7 @@ export async function sendLoginname(command: SendLoginnameCommand) {
       const basePath = process.env.NEXT_PUBLIC_BASE_PATH ?? "";
 
       const url = await startIdentityProviderFlow({
-        serviceUrl,
+        serviceConfig,
         idpId: idp.id,
         urls: {
           successUrl:
@@ -216,10 +204,7 @@ export async function sendLoginname(command: SendLoginnameCommand) {
     const user = users[0];
     const userId = users[0].userId;
 
-    const userLoginSettings = await getLoginSettings({
+    const userLoginSettings = await getLoginSettings({ serviceConfig, organization: user.details?.resourceOwner });
-      serviceUrl,
-      organization: user.details?.resourceOwner,
-    });
 
     // compare with the concatenated suffix when set
     const concatLoginname = command.suffix ? `${command.loginName}@${command.suffix}` : command.loginName;
@@ -273,10 +258,7 @@ export async function sendLoginname(command: SendLoginnameCommand) {
     // Resolve organization from command or session
     const organization = command.organization ?? session.factors?.user?.organizationId;
 
-    const methods = await listAuthenticationMethodTypes({
+    const methods = await listAuthenticationMethodTypes({ serviceConfig, userId: session.factors?.user?.id });
-      serviceUrl,
-      userId: session.factors?.user?.id,
-    });
 
     // always resend invite if user has no auth method set
     if (!methods.authMethodTypes || !methods.authMethodTypes.length) {
@@ -418,18 +400,12 @@ export async function sendLoginname(command: SendLoginnameCommand) {
     const suffix = matched?.[1] ?? "";
 
     // this just returns orgs where the suffix is set as primary domain
-    const orgs = await getOrgsByDomain({
+    const orgs = await getOrgsByDomain({ serviceConfig, domain: suffix });
-      serviceUrl,
-      domain: suffix,
-    });
 
     const orgToCheckForDiscovery = orgs.result && orgs.result.length === 1 ? orgs.result[0].id : undefined;
 
     if (orgToCheckForDiscovery) {
-      const orgLoginSettings = await getLoginSettings({
+      const orgLoginSettings = await getLoginSettings({ serviceConfig, organization: orgToCheckForDiscovery });
-        serviceUrl,
-        organization: orgToCheckForDiscovery,
-      });
 
       if (orgLoginSettings?.allowDomainDiscovery) {
         console.log("org discovery successful, using org:", orgToCheckForDiscovery);

apps/login/src/lib/server/oidc.ts

@@ -2,14 +2,12 @@
 
 import { getDeviceAuthorizationRequest as zitadelGetDeviceAuthorizationRequest } from "@/lib/zitadel";
 import { headers } from "next/headers";
-import { getServiceUrlFromHeaders } from "../service-url";
+import { getServiceConfig } from "../service-url";
 
 export async function getDeviceAuthorizationRequest(userCode: string) {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
-  return zitadelGetDeviceAuthorizationRequest({
+  return zitadelGetDeviceAuthorizationRequest({ serviceConfig, userCode,
-    serviceUrl,
-    userCode,
   });
 }

apps/login/src/lib/server/passkeys.test.ts

@@ -14,7 +14,7 @@ vi.mock("@zitadel/client", () => ({
 }));
 
 vi.mock("../service-url", () => ({
-  getServiceUrlFromHeaders: vi.fn(),
+  getServiceConfig: vi.fn(),
 }));
 
 vi.mock("../zitadel", () => ({
@@ -62,7 +62,7 @@ describe("sendPasskey", () => {
 
     // Import mocked modules
     const { headers } = await import("next/headers");
-    const { getServiceUrlFromHeaders } = await import("../service-url");
+    const { getServiceConfig } = await import("../service-url");
     const { getLoginSettings, getUserByID } = await import("../zitadel");
     const { setSessionAndUpdateCookie } = await import("./cookie");
     const { getSessionCookieById, getSessionCookieByLoginName, getMostRecentSessionCookie } = await import("../cookies");
@@ -71,7 +71,7 @@ describe("sendPasskey", () => {
 
     // Setup mocks
     mockHeaders = vi.mocked(headers);
-    mockGetServiceUrlFromHeaders = vi.mocked(getServiceUrlFromHeaders);
+    mockGetServiceUrlFromHeaders = vi.mocked(getServiceConfig);
     mockGetLoginSettings = vi.mocked(getLoginSettings);
     mockGetUserByID = vi.mocked(getUserByID);
     mockSetSessionAndUpdateCookie = vi.mocked(setSessionAndUpdateCookie);

apps/login/src/lib/server/passkeys.ts

@@ -20,10 +20,10 @@ import { headers } from "next/headers";
 import { userAgent } from "next/server";
 import { getTranslations } from "next-intl/server";
 import { getMostRecentSessionCookie, getSessionCookieById, getSessionCookieByLoginName } from "../cookies";
-import { getServiceUrlFromHeaders } from "../service-url";
+import { getServiceConfig } from "../service-url";
 import { checkEmailVerification, checkUserVerification } from "../verify-helper";
 import { createSessionAndUpdateCookie, setSessionAndUpdateCookie } from "./cookie";
-import { getOriginalHost } from "./host";
+import { getPublicHost } from "./host";
 import { completeFlowOrGetUrl } from "../client";
 
 type VerifyPasskeyCommand = {
@@ -63,8 +63,8 @@ export async function registerPasskeyLink(
   }
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
-  const host = await getOriginalHost();
+  const host = getPublicHost(_headers);
 
   let session: GetSessionResponse | undefined;
   let createdSession: Session | undefined;
@@ -74,11 +74,7 @@ export async function registerPasskeyLink(
   if (command.sessionId) {
     // Session-based flow (existing logic)
     const sessionCookie = await getSessionCookieById({ sessionId: command.sessionId });
-    session = await getSession({
+    session = await getSession({ serviceConfig, sessionId: sessionCookie.id, sessionToken: sessionCookie.token });
-      serviceUrl,
-      sessionId: sessionCookie.id,
-      sessionToken: sessionCookie.token,
-    });
 
     if (!session?.session?.factors?.user?.id) {
       return { error: "Could not determine user from session" };
@@ -89,10 +85,7 @@ export async function registerPasskeyLink(
     const sessionValid = isSessionValid(session.session);
 
     if (!sessionValid.valid) {
-      const authmethods = await listAuthenticationMethodTypes({
+      const authmethods = await listAuthenticationMethodTypes({ serviceConfig, userId: currentUserId });
-        serviceUrl,
-        userId: currentUserId,
-      });
 
       // if the user has no authmethods set, we need to check if the user was verified
       if (authmethods.authMethodTypes.length !== 0) {
@@ -117,10 +110,7 @@ export async function registerPasskeyLink(
         code: command.code,
       };
     } else {
-      const codeResponse = await createPasskeyRegistrationLink({
+      const codeResponse = await createPasskeyRegistrationLink({ serviceConfig, userId: currentUserId });
-        serviceUrl,
-        userId: currentUserId,
-      });
 
       if (!codeResponse?.code?.code) {
         return { error: "Could not create registration link" };
@@ -136,10 +126,7 @@ export async function registerPasskeyLink(
     };
 
     // Check if user exists
-    const userResponse = await getUserByID({
+    const userResponse = await getUserByID({ serviceConfig, userId: currentUserId });
-      serviceUrl,
-      userId: currentUserId,
-    });
 
     if (!userResponse || !userResponse.user) {
       return { error: "User not found" };
@@ -179,17 +166,12 @@ export async function registerPasskeyLink(
     throw new Error("Could not determine user");
   }
 
-  return registerPasskey({
+  return registerPasskey({ serviceConfig, userId: currentUserId, code: registerCode, domain: hostname });
-    serviceUrl,
-    userId: currentUserId,
-    code: registerCode,
-    domain: hostname,
-  });
 }
 
 export async function verifyPasskeyRegistration(command: VerifyPasskeyCommand) {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   if (!command.sessionId && !command.userId) {
     throw new Error("Either sessionId or userId must be provided");
@@ -214,11 +196,7 @@ export async function verifyPasskeyRegistration(command: VerifyPasskeyCommand) {
     const sessionCookie = await getSessionCookieById({
       sessionId: command.sessionId,
     });
-    const session = await getSession({
+    const session = await getSession({ serviceConfig, sessionId: sessionCookie.id, sessionToken: sessionCookie.token });
-      serviceUrl,
-      sessionId: sessionCookie.id,
-      sessionToken: sessionCookie.token,
-    });
     const userId = session?.session?.factors?.user?.id;
 
     if (!userId) {
@@ -231,10 +209,7 @@ export async function verifyPasskeyRegistration(command: VerifyPasskeyCommand) {
     currentUserId = command.userId!;
 
     // Verify user exists
-    const userResponse = await getUserByID({
+    const userResponse = await getUserByID({ serviceConfig, userId: currentUserId });
-      serviceUrl,
-      userId: currentUserId,
-    });
 
     if (!userResponse || !userResponse.user) {
       throw new Error("User not found");
@@ -242,7 +217,7 @@ export async function verifyPasskeyRegistration(command: VerifyPasskeyCommand) {
   }
 
   return zitadelVerifyPasskeyRegistration({
-    serviceUrl,
+    serviceConfig,
     request: create(VerifyPasskeyRegistrationRequestSchema, {
       passkeyId: command.passkeyId,
       publicKeyCredential: command.publicKeyCredential,
@@ -279,12 +254,9 @@ export async function sendPasskey(command: SendPasskeyCommand) {
   }
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
-  const loginSettings = await getLoginSettings({
+  const loginSettings = await getLoginSettings({ serviceConfig, organization });
-    serviceUrl,
-    organization,
-  });
 
   let lifetime = command.lifetime; // Use provided lifetime first
 
@@ -318,10 +290,7 @@ export async function sendPasskey(command: SendPasskeyCommand) {
 
   let userResponse;
   try {
-    userResponse = await getUserByID({
+    userResponse = await getUserByID({ serviceConfig, userId: session?.factors?.user?.id });
-      serviceUrl,
-      userId: session?.factors?.user?.id,
-    });
   } catch (error) {
     console.error("Error fetching user by ID:", error);
     return { error: t("verify.errors.couldNotGetUser") };

apps/login/src/lib/server/password.ts

@@ -10,6 +10,7 @@ import {
   listAuthenticationMethodTypes,
   listUsers,
   passwordReset,
+  ServiceConfig,
   setPassword,
   setUserPassword,
 } from "@/lib/zitadel";
@@ -22,8 +23,8 @@ import { SetPasswordRequestSchema } from "@zitadel/proto/zitadel/user/v2/user_se
 import { headers } from "next/headers";
 import { completeFlowOrGetUrl } from "../client";
 import { getSessionCookieById, getSessionCookieByLoginName } from "../cookies";
-import { getServiceUrlFromHeaders } from "../service-url";
+import { getServiceConfig } from "../service-url";
-import { getOriginalHostWithProtocol } from "./host";
+import { getPublicHostWithProtocol } from "./host";
 import {
   checkEmailVerification,
   checkMFAFactors,
@@ -41,18 +42,14 @@ type ResetPasswordCommand = {
 
 export async function resetPassword(command: ResetPasswordCommand) {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   const t = await getTranslations("password");
 
   // Get the original host that the user sees with protocol
-  const hostWithProtocol = await getOriginalHostWithProtocol();
+  const hostWithProtocol = await getPublicHostWithProtocol(_headers);
 
-  const users = await listUsers({
+  const users = await listUsers({ serviceConfig, loginName: command.loginName, organizationId: command.organization });
-    serviceUrl,
-    loginName: command.loginName,
-    organizationId: command.organization,
-  });
 
   if (!users.details || users.details.totalResult !== BigInt(1) || !users.result[0].userId) {
     return { error: t("errors.couldNotSendResetLink") };
@@ -62,7 +59,7 @@ export async function resetPassword(command: ResetPasswordCommand) {
   const basePath = process.env.NEXT_PUBLIC_BASE_PATH ?? "";
 
   return passwordReset({
-    serviceUrl,
+    serviceConfig,
     userId,
     urlTemplate:
       `${hostWithProtocol}${basePath}/password/set?code={{.Code}}&userId={{.UserID}}&organization={{.OrgID}}` +
@@ -79,7 +76,7 @@ export type UpdateSessionCommand = {
 
 export async function sendPassword(command: UpdateSessionCommand): Promise<{ error: string } | { redirect: string }> {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
   const t = await getTranslations("password");
 
   let sessionCookie = await getSessionCookieByLoginName({
@@ -94,11 +91,7 @@ export async function sendPassword(command: UpdateSessionCommand): Promise<{ err
   let loginSettings: LoginSettings | undefined;
 
   if (!sessionCookie) {
-    const users = await listUsers({
+    const users = await listUsers({ serviceConfig, loginName: command.loginName, organizationId: command.organization });
-      serviceUrl,
-      loginName: command.loginName,
-      organizationId: command.organization,
-    });
 
     if (users.details?.totalResult == BigInt(1) && users.result[0].userId) {
       user = users.result[0];
@@ -108,10 +101,7 @@ export async function sendPassword(command: UpdateSessionCommand): Promise<{ err
         password: { password: command.checks.password?.password },
       });
 
-      loginSettings = await getLoginSettings({
+      loginSettings = await getLoginSettings({ serviceConfig, organization: command.organization });
-        serviceUrl,
-        organization: command.organization,
-      });
 
       try {
         session = await createSessionAndUpdateCookie({
@@ -121,10 +111,7 @@ export async function sendPassword(command: UpdateSessionCommand): Promise<{ err
         });
       } catch (error: any) {
         if ("failedAttempts" in error && error.failedAttempts) {
-          const lockoutSettings = await getLockoutSettings({
+          const lockoutSettings = await getLockoutSettings({ serviceConfig, orgId: command.organization });
-            serviceUrl,
-            orgId: command.organization,
-          });
 
           const hasLimit =
             lockoutSettings?.maxPasswordAttempts !== undefined && lockoutSettings?.maxPasswordAttempts > BigInt(0);
@@ -149,10 +136,7 @@ export async function sendPassword(command: UpdateSessionCommand): Promise<{ err
     // this is a fake error message to hide that the user does not even exist
     return { error: t("errors.couldNotVerifyPassword") };
   } else {
-    loginSettings = await getLoginSettings({
+    loginSettings = await getLoginSettings({ serviceConfig, organization: sessionCookie.organization });
-      serviceUrl,
-      organization: sessionCookie.organization,
-    });
 
     if (!loginSettings) {
       return { error: "Could not load login settings" };
@@ -177,10 +161,7 @@ export async function sendPassword(command: UpdateSessionCommand): Promise<{ err
       });
     } catch (error: any) {
       if ("failedAttempts" in error && error.failedAttempts) {
-        const lockoutSettings = await getLockoutSettings({
+        const lockoutSettings = await getLockoutSettings({ serviceConfig, orgId: command.organization });
-          serviceUrl,
-          orgId: command.organization,
-        });
 
         const hasLimit =
           lockoutSettings?.maxPasswordAttempts !== undefined && lockoutSettings?.maxPasswordAttempts > BigInt(0);
@@ -202,10 +183,7 @@ export async function sendPassword(command: UpdateSessionCommand): Promise<{ err
       return { error: t("errors.couldNotCreateSessionForUser") };
     }
 
-    const userResponse = await getUserByID({
+    const userResponse = await getUserByID({ serviceConfig, userId: session?.factors?.user?.id });
-      serviceUrl,
-      userId: session?.factors?.user?.id,
-    });
 
     if (!userResponse.user) {
       return { error: t("errors.userNotFound") };
@@ -216,7 +194,7 @@ export async function sendPassword(command: UpdateSessionCommand): Promise<{ err
 
   if (!loginSettings) {
     loginSettings = await getLoginSettings({
-      serviceUrl,
+      serviceConfig,
       organization: command.organization ?? session.factors?.user?.organizationId,
     });
   }
@@ -228,7 +206,7 @@ export async function sendPassword(command: UpdateSessionCommand): Promise<{ err
   const humanUser = user.type.case === "human" ? user.type.value : undefined;
 
   const expirySettings = await getPasswordExpirySettings({
-    serviceUrl,
+    serviceConfig,
     orgId: command.organization ?? session.factors?.user?.organizationId,
   });
 
@@ -260,10 +238,7 @@ export async function sendPassword(command: UpdateSessionCommand): Promise<{ err
   // if password, check if user has MFA methods
   let authMethods;
   if (command.checks && command.checks.password && session.factors?.user?.id) {
-    const response = await listAuthenticationMethodTypes({
+    const response = await listAuthenticationMethodTypes({ serviceConfig, userId: session.factors.user.id });
-      serviceUrl,
-      userId: session.factors.user.id,
-    });
     if (response.authMethodTypes && response.authMethodTypes.length) {
       authMethods = response.authMethodTypes;
     }
@@ -274,7 +249,7 @@ export async function sendPassword(command: UpdateSessionCommand): Promise<{ err
   }
 
   const mfaFactorCheck = await checkMFAFactors(
-    serviceUrl,
+    serviceConfig,
     session,
     loginSettings,
     authMethods,
@@ -331,14 +306,11 @@ export async function sendPassword(command: UpdateSessionCommand): Promise<{ err
 // this function lets users with code set a password or users with valid User Verification Check
 export async function changePassword(command: { code?: string; userId: string; password: string }) {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
   const t = await getTranslations("password");
 
   // check for init state
-  const { user } = await getUserByID({
+  const { user } = await getUserByID({ serviceConfig, userId: command.userId });
-    serviceUrl,
-    userId: command.userId,
-  });
 
   if (!user || user.userId !== command.userId) {
     return { error: t("errors.couldNotSendResetLink") };
@@ -351,10 +323,7 @@ export async function changePassword(command: { code?: string; userId: string; p
 
   // check if the user has no password set in order to set a password
   if (!command.code) {
-    const authmethods = await listAuthenticationMethodTypes({
+    const authmethods = await listAuthenticationMethodTypes({ serviceConfig, userId });
-      serviceUrl,
-      userId,
-    });
 
     // if the user has no authmethods set, we need to check if the user was verified
     if (authmethods.authMethodTypes.length !== 0) {
@@ -371,12 +340,7 @@ export async function changePassword(command: { code?: string; userId: string; p
     }
   }
 
-  return setUserPassword({
+  return setUserPassword({ serviceConfig, userId, password: command.password, code: command.code });
-    serviceUrl,
-    userId,
-    password: command.password,
-    code: command.code,
-  });
 }
 
 type CheckSessionAndSetPasswordCommand = {
@@ -386,7 +350,7 @@ type CheckSessionAndSetPasswordCommand = {
 
 export async function checkSessionAndSetPassword({ sessionId, password }: CheckSessionAndSetPasswordCommand) {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
   const t = await getTranslations("password");
 
   let sessionCookie;
@@ -400,7 +364,7 @@ export async function checkSessionAndSetPassword({ sessionId, password }: CheckS
   let session;
   try {
     const sessionResponse = await getSession({
-      serviceUrl,
+      serviceConfig,
       sessionId: sessionCookie.id,
       sessionToken: sessionCookie.token,
     });
@@ -424,10 +388,7 @@ export async function checkSessionAndSetPassword({ sessionId, password }: CheckS
   // check if the user has no password set in order to set a password
   let authmethods;
   try {
-    authmethods = await listAuthenticationMethodTypes({
+    authmethods = await listAuthenticationMethodTypes({ serviceConfig, userId: session.factors.user.id });
-      serviceUrl,
-      userId: session.factors.user.id,
-    });
   } catch (error) {
     console.error("Error getting auth methods:", error);
     return { error: "Could not load auth methods" };
@@ -439,10 +400,7 @@ export async function checkSessionAndSetPassword({ sessionId, password }: CheckS
 
   let loginSettings;
   try {
-    loginSettings = await getLoginSettings({
+    loginSettings = await getLoginSettings({ serviceConfig, organization: session.factors.user.organizationId });
-      serviceUrl,
-      organization: session.factors.user.organizationId,
-    });
   } catch (error) {
     console.error("Error getting login settings:", error);
     return { error: "Could not load login settings" };
@@ -453,7 +411,7 @@ export async function checkSessionAndSetPassword({ sessionId, password }: CheckS
   // if the user has no MFA but MFA is enforced, we can set a password otherwise we use the token of the user
   if (forceMfa) {
     console.log("Set password using service account due to enforced MFA without existing MFA methods");
-    return setPassword({ serviceUrl, payload }).catch((error) => {
+    return setPassword({ serviceConfig, payload }).catch((error) => {
       // throw error if failed precondition (ex. User is not yet initialized)
       if (error.code === 9 && error.message) {
         return { error: t("errors.failedPrecondition") };
@@ -461,16 +419,16 @@ export async function checkSessionAndSetPassword({ sessionId, password }: CheckS
       return { error: "Could not set password" };
     });
   } else {
-    const transport = async (serviceUrl: string, token: string) => {
+    const transport = async (serviceConfig: ServiceConfig, token: string) => {
-      return createServerTransport(token, serviceUrl);
+      return createServerTransport(token, serviceConfig);
     };
 
-    const myUserService = async (serviceUrl: string, sessionToken: string) => {
+    const myUserService = async (serviceConfig: ServiceConfig, sessionToken: string) => {
-      const transportPromise = await transport(serviceUrl, sessionToken);
+      const transportPromise = await transport(serviceConfig, sessionToken);
       return createUserServiceClient(transportPromise);
     };
 
-    const selfService = await myUserService(serviceUrl, `${sessionCookie.token}`);
+    const selfService = await myUserService(serviceConfig, sessionCookie.token);
 
     return selfService
       .setPassword(

apps/login/src/lib/server/register.ts

@@ -7,7 +7,7 @@ import { Factors } from "@zitadel/proto/zitadel/session/v2/session_pb";
 import { ChecksJson, ChecksSchema } from "@zitadel/proto/zitadel/session/v2/session_service_pb";
 import { cookies, headers } from "next/headers";
 import { getTranslations } from "next-intl/server";
-import { getServiceUrlFromHeaders } from "../service-url";
+import { getServiceConfig } from "../service-url";
 import { checkEmailVerification, checkMFAFactors } from "../verify-helper";
 import { getOrSetFingerprintId } from "../fingerprint";
 import crypto from "crypto";
@@ -30,11 +30,9 @@ export type RegisterUserResponse = {
 export async function registerUser(command: RegisterUserCommand) {
   const t = await getTranslations("register");
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
-  const addResponse = await addHumanUser({
+  const addResponse = await addHumanUser({ serviceConfig, email: command.email,
-    serviceUrl,
-    email: command.email,
     firstName: command.firstName,
     lastName: command.lastName,
     password: command.password ? command.password : undefined,
@@ -45,9 +43,7 @@ export async function registerUser(command: RegisterUserCommand) {
     return { error: t("errors.couldNotCreateUser") };
   }
 
-  const loginSettings = await getLoginSettings({
+  const loginSettings = await getLoginSettings({ serviceConfig, organization: command.organization,
-    serviceUrl,
-    organization: command.organization,
   });
 
   let checkPayload: any = {
@@ -100,9 +96,7 @@ export async function registerUser(command: RegisterUserCommand) {
 
     return { redirect: "/passkey/set?" + params };
   } else {
-    const userResponse = await getUserByID({
+    const userResponse = await getUserByID({ serviceConfig, userId: session?.factors?.user?.id,
-      serviceUrl,
-      userId: session?.factors?.user?.id,
     });
 
     if (!userResponse.user) {
@@ -162,11 +156,9 @@ export async function registerUserAndLinkToIDP(command: RegisterUserAndLinkToIDP
   const t = await getTranslations("register");
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
-  const addUserResponse = await addHumanUser({
+  const addUserResponse = await addHumanUser({ serviceConfig, email: command.email,
-    serviceUrl,
-    email: command.email,
     firstName: command.firstName,
     lastName: command.lastName,
     organization: command.organization,
@@ -176,14 +168,10 @@ export async function registerUserAndLinkToIDP(command: RegisterUserAndLinkToIDP
     return { error: t("errors.couldNotCreateUser") };
   }
 
-  const loginSettings = await getLoginSettings({
+  const loginSettings = await getLoginSettings({ serviceConfig, organization: command.organization,
-    serviceUrl,
-    organization: command.organization,
   });
 
-  const idpLink = await addIDPLink({
+  const idpLink = await addIDPLink({ serviceConfig, idp: {
-    serviceUrl,
-    idp: {
       id: command.idpId,
       userId: command.idpUserId,
       userName: command.idpUserName,
@@ -207,7 +195,7 @@ export async function registerUserAndLinkToIDP(command: RegisterUserAndLinkToIDP
   }
 
   // const userResponse = await getUserByID({
-  //   serviceUrl,
+  //   serviceConfig.baseUrl,
   //   userId: session?.factors?.user?.id,
   // });
 
@@ -227,9 +215,7 @@ export async function registerUserAndLinkToIDP(command: RegisterUserAndLinkToIDP
   // check if user has MFA methods
   let authMethods;
   if (session.factors?.user?.id) {
-    const response = await listAuthenticationMethodTypes({
+    const response = await listAuthenticationMethodTypes({ serviceConfig, userId: session.factors.user.id,
-      serviceUrl,
-      userId: session.factors.user.id,
     });
     if (response.authMethodTypes && response.authMethodTypes.length) {
       authMethods = response.authMethodTypes;
@@ -239,7 +225,7 @@ export async function registerUserAndLinkToIDP(command: RegisterUserAndLinkToIDP
   // Always check MFA factors, even if no auth methods are configured
   // This ensures that force MFA settings are respected
   const mfaFactorCheck = await checkMFAFactors(
-    serviceUrl,
+    serviceConfig,
     session,
     loginSettings,
     authMethods || [], // Pass empty array if no auth methods

apps/login/src/lib/server/session.ts

@@ -21,8 +21,8 @@ import {
   getSessionCookieByLoginName,
   removeSessionFromCookie,
 } from "../cookies";
-import { getServiceUrlFromHeaders } from "../service-url";
+import { getServiceConfig } from "../service-url";
-import { getOriginalHost } from "./host";
+import { getPublicHost } from "./host";
 
 export async function skipMFAAndContinueWithNextUrl({
   userId,
@@ -38,14 +38,11 @@ export async function skipMFAAndContinueWithNextUrl({
   organization?: string;
 }): Promise<{ redirect: string } | { error: string }> {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
-  const loginSettings = await getLoginSettings({
+  const loginSettings = await getLoginSettings({ serviceConfig, organization: organization });
-    serviceUrl,
-    organization: organization,
-  });
 
-  await humanMFAInitSkipped({ serviceUrl, userId });
+  await humanMFAInitSkipped({ serviceConfig, userId });
 
   if (requestId && sessionId) {
     return completeFlowOrGetUrl(
@@ -73,14 +70,11 @@ export type ContinueWithSessionCommand = Session & { requestId?: string };
 
 export async function continueWithSession({ requestId, ...session }: ContinueWithSessionCommand) {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   const t = await getTranslations("error");
 
-  const loginSettings = await getLoginSettings({
+  const loginSettings = await getLoginSettings({ serviceConfig, organization: session.factors?.user?.organizationId });
-    serviceUrl,
-    organization: session.factors?.user?.organizationId,
-  });
 
   if (requestId && session.id && session.factors?.user) {
     return completeFlowOrGetUrl(
@@ -130,8 +124,8 @@ export async function updateSession(options: UpdateSessionCommand) {
   }
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
-  const host = await getOriginalHost();
+  const host = getPublicHost(_headers);
 
   if (!host) {
     return { error: "Could not get host" };
@@ -143,10 +137,7 @@ export async function updateSession(options: UpdateSessionCommand) {
     challenges.webAuthN.domain = hostname;
   }
 
-  const loginSettings = await getLoginSettings({
+  const loginSettings = await getLoginSettings({ serviceConfig, organization });
-    serviceUrl,
-    organization,
-  });
 
   let lifetime = checks?.webAuthN
     ? loginSettings?.multiFactorCheckLifetime // TODO different lifetime for webauthn u2f/passkey
@@ -177,10 +168,7 @@ export async function updateSession(options: UpdateSessionCommand) {
   // if password, check if user has MFA methods
   let authMethods;
   if (checks && checks.password && session.factors?.user?.id) {
-    const response = await listAuthenticationMethodTypes({
+    const response = await listAuthenticationMethodTypes({ serviceConfig, userId: session.factors.user.id });
-      serviceUrl,
-      userId: session.factors.user.id,
-    });
     if (response.authMethodTypes && response.authMethodTypes.length) {
       authMethods = response.authMethodTypes;
     }
@@ -200,19 +188,19 @@ type ClearSessionOptions = {
 
 export async function clearSession(options: ClearSessionOptions) {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   const { sessionId } = options;
 
   const sessionCookie = await getSessionCookieById({ sessionId });
 
   const deleteResponse = await deleteSession({
-    serviceUrl,
+    serviceConfig,
     sessionId: sessionCookie.id,
     sessionToken: sessionCookie.token,
   });
 
-  const securitySettings = await getSecuritySettings({ serviceUrl });
+  const securitySettings = await getSecuritySettings({ serviceConfig });
   const iFrameEnabled = !!securitySettings?.embeddedIframe?.enabled;
 
   if (!deleteResponse) {

apps/login/src/lib/server/u2f.ts

@@ -6,8 +6,8 @@ import { VerifyU2FRegistrationRequestSchema } from "@zitadel/proto/zitadel/user/
 import { headers } from "next/headers";
 import { userAgent } from "next/server";
 import { getSessionCookieById } from "../cookies";
-import { getServiceUrlFromHeaders } from "../service-url";
+import { getServiceConfig } from "../service-url";
-import { getOriginalHost } from "./host";
+import { getPublicHost } from "./host";
 
 type RegisterU2FCommand = {
   sessionId: string;
@@ -22,8 +22,8 @@ type VerifyU2FCommand = {
 
 export async function addU2F(command: RegisterU2FCommand) {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
-  const host = await getOriginalHost();
+  const host = getPublicHost(_headers);
 
   const sessionCookie = await getSessionCookieById({
     sessionId: command.sessionId,
@@ -33,11 +33,7 @@ export async function addU2F(command: RegisterU2FCommand) {
     return { error: "Could not get session" };
   }
 
-  const session = await getSession({
+  const session = await getSession({ serviceConfig, sessionId: sessionCookie.id, sessionToken: sessionCookie.token });
-    serviceUrl,
-    sessionId: sessionCookie.id,
-    sessionToken: sessionCookie.token,
-  });
 
   const [hostname] = host.split(":");
 
@@ -51,12 +47,12 @@ export async function addU2F(command: RegisterU2FCommand) {
     return { error: "Could not get session" };
   }
 
-  return registerU2F({ serviceUrl, userId, domain: hostname });
+  return registerU2F({ serviceConfig, userId, domain: hostname });
 }
 
 export async function verifyU2F(command: VerifyU2FCommand) {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
   let passkeyName = command.passkeyName;
   if (!passkeyName) {
     const headersList = await headers();
@@ -71,11 +67,7 @@ export async function verifyU2F(command: VerifyU2FCommand) {
     sessionId: command.sessionId,
   });
 
-  const session = await getSession({
+  const session = await getSession({ serviceConfig, sessionId: sessionCookie.id, sessionToken: sessionCookie.token });
-    serviceUrl,
-    sessionId: sessionCookie.id,
-    sessionToken: sessionCookie.token,
-  });
 
   const userId = session?.session?.factors?.user?.id;
 
@@ -90,5 +82,5 @@ export async function verifyU2F(command: VerifyU2FCommand) {
     userId,
   });
 
-  return verifyU2FRegistration({ serviceUrl, request });
+  return verifyU2FRegistration({ serviceConfig, request });
 }

apps/login/src/lib/server/verify.ts

@@ -20,30 +20,26 @@ import { cookies, headers } from "next/headers";
 import { completeFlowOrGetUrl } from "../client";
 import { getSessionCookieByLoginName } from "../cookies";
 import { getOrSetFingerprintId } from "../fingerprint";
-import { getServiceUrlFromHeaders } from "../service-url";
+import { getServiceConfig } from "../service-url";
 import { loadMostRecentSession } from "../session";
 import { checkMFAFactors } from "../verify-helper";
 import { createSessionAndUpdateCookie } from "./cookie";
-import { getOriginalHostWithProtocol } from "./host";
+import { getPublicHostWithProtocol } from "./host";
 import { getTranslations } from "next-intl/server";
 
 export async function verifyTOTP(code: string, loginName?: string, organization?: string) {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   return loadMostRecentSession({
-    serviceUrl,
+    serviceConfig,
     sessionParams: {
       loginName,
       organization,
     },
   }).then((session) => {
     if (session?.factors?.user?.id) {
-      return verifyTOTPRegistration({
+      return verifyTOTPRegistration({ serviceConfig, code, userId: session.factors.user.id });
-        serviceUrl,
-        code,
-        userId: session.factors.user.id,
-      });
     } else {
       throw Error("No user id found in session.");
     }
@@ -62,22 +58,14 @@ type VerifyUserByEmailCommand = {
 export async function sendVerification(command: VerifyUserByEmailCommand) {
   const t = await getTranslations("verify");
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
   const verifyResponse = command.isInvite
-    ? await verifyInviteCode({
+    ? await verifyInviteCode({ serviceConfig, userId: command.userId, verificationCode: command.code }).catch((error) => {
-        serviceUrl,
-        userId: command.userId,
-        verificationCode: command.code,
-      }).catch((error) => {
         console.warn(error);
         return { error: t("errors.couldNotVerifyInvite") };
       })
-    : await verifyEmail({
+    : await verifyEmail({ serviceConfig, userId: command.userId, verificationCode: command.code }).catch((error) => {
-        serviceUrl,
-        userId: command.userId,
-        verificationCode: command.code,
-      }).catch((error) => {
         console.warn(error);
         return { error: t("errors.couldNotVerifyEmail") };
       });
@@ -91,10 +79,7 @@ export async function sendVerification(command: VerifyUserByEmailCommand) {
   }
 
   let session: Session | undefined;
-  const userResponse = await getUserByID({
+  const userResponse = await getUserByID({ serviceConfig, userId: command.userId });
-    serviceUrl,
-    userId: command.userId,
-  });
 
   if (!userResponse || !userResponse.user) {
     return { error: t("errors.couldNotLoadUser") };
@@ -110,22 +95,17 @@ export async function sendVerification(command: VerifyUserByEmailCommand) {
   });
 
   if (sessionCookie) {
-    session = await getSession({
+    session = await getSession({ serviceConfig, sessionId: sessionCookie.id, sessionToken: sessionCookie.token }).then(
-      serviceUrl,
+      (response) => {
-      sessionId: sessionCookie.id,
+        if (response?.session) {
-      sessionToken: sessionCookie.token,
+          return response.session;
-    }).then((response) => {
+        }
-      if (response?.session) {
+      },
-        return response.session;
+    );
-      }
-    });
   }
 
   // load auth methods for user
-  const authMethodResponse = await listAuthenticationMethodTypes({
+  const authMethodResponse = await listAuthenticationMethodTypes({ serviceConfig, userId: user.userId });
-    serviceUrl,
-    userId: user.userId,
-  });
 
   if (!authMethodResponse || !authMethodResponse.authMethodTypes) {
     return { error: t("errors.couldNotLoadAuthenticators") };
@@ -203,14 +183,11 @@ export async function sendVerification(command: VerifyUserByEmailCommand) {
     return { redirect: `/verify/success?${verifySuccessParams}` };
   }
 
-  const loginSettings = await getLoginSettings({
+  const loginSettings = await getLoginSettings({ serviceConfig, organization: user.details?.resourceOwner });
-    serviceUrl,
-    organization: user.details?.resourceOwner,
-  });
 
   // redirect to mfa factor if user has one, or redirect to set one up
   const mfaFactorCheck = await checkMFAFactors(
-    serviceUrl,
+    serviceConfig,
     session,
     loginSettings,
     authMethodResponse.authMethodTypes,
@@ -253,14 +230,14 @@ type resendVerifyEmailCommand = {
 export async function resendVerification(command: resendVerifyEmailCommand) {
   const t = await getTranslations("verify");
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
-  const hostWithProtocol = await getOriginalHostWithProtocol();
+  const hostWithProtocol = await getPublicHostWithProtocol(_headers);
 
   const basePath = process.env.NEXT_PUBLIC_BASE_PATH ?? "";
 
   return command.isInvite
     ? createInviteCode({
-        serviceUrl,
+        serviceConfig,
         userId: command.userId,
         urlTemplate:
           `${hostWithProtocol}${basePath}/verify?code={{.Code}}&userId={{.UserID}}&organization={{.OrgID}}&invite=true` +
@@ -272,8 +249,8 @@ export async function resendVerification(command: resendVerifyEmailCommand) {
         return { error: t("errors.couldNotResendInvite") };
       })
     : zitadelSendEmailCode({
+        serviceConfig,
         userId: command.userId,
-        serviceUrl,
         urlTemplate:
           `${hostWithProtocol}${basePath}/verify?code={{.Code}}&userId={{.UserID}}&organization={{.OrgID}}` +
           (command.requestId ? `&requestId=${command.requestId}` : ""),
@@ -287,22 +264,14 @@ type SendEmailCommand = {
 
 export async function sendEmailCode(command: SendEmailCommand) {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
-  return zitadelSendEmailCode({
+  return zitadelSendEmailCode({ serviceConfig, userId: command.userId, urlTemplate: command.urlTemplate });
-    serviceUrl,
-    userId: command.userId,
-    urlTemplate: command.urlTemplate,
-  });
 }
 
 export async function sendInviteEmailCode(command: SendEmailCommand) {
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
-  return createInviteCode({
+  return createInviteCode({ serviceConfig, userId: command.userId, urlTemplate: command.urlTemplate });
-    serviceUrl,
-    userId: command.userId,
-    urlTemplate: command.urlTemplate,
-  });
 }

apps/login/src/lib/service-url.test.ts

@@ -0,0 +1,217 @@
+import { describe, expect, test, beforeEach, afterEach, vi } from "vitest";
+import { getServiceConfig, constructUrl } from "./service-url";
+import { NextRequest } from "next/server";
+
+describe("Service URL utilities", () => {
+  const originalEnv = process.env;
+
+  beforeEach(() => {
+    process.env = { ...originalEnv };
+  });
+
+  afterEach(() => {
+    process.env = originalEnv;
+  });
+
+  describe("getServiceConfig", () => {
+    test("should throw when ZITADEL_API_URL is not set", () => {
+      process.env.ZITADEL_API_URL = undefined as any;
+
+      const mockHeaders = {
+        get: vi.fn(() => null),
+      } as any;
+
+      expect(() => getServiceConfig(mockHeaders)).toThrow("ZITADEL_API_URL is not set");
+    });
+
+    test("should return only baseUrl when x-zitadel-forward-host is not present (self-hosted)", () => {
+      process.env.ZITADEL_API_URL = "https://zitadel.mycompany.com";
+
+      const mockHeaders = {
+        get: vi.fn((key: string) => {
+          if (key === "x-zitadel-forward-host") return null;
+          if (key === "host") return "mycompany.com";
+          return null;
+        }),
+      } as any;
+
+      const result = getServiceConfig(mockHeaders);
+
+      expect(result.serviceConfig.baseUrl).toBe("https://zitadel.mycompany.com");
+      expect(result.serviceConfig.instanceHost).toBeUndefined();
+      expect(result.serviceConfig.publicHost).toBe("mycompany.com");
+    });
+
+    test("should use x-zitadel-forward-host when present (multi-tenant)", () => {
+      process.env.ZITADEL_API_URL = "https://api.zitadel.cloud";
+
+      const mockHeaders = {
+        get: vi.fn((key: string) => {
+          if (key === "x-zitadel-forward-host") return "customer.zitadel.cloud";
+          if (key === "host") return "customer.zitadel.cloud";
+          return null;
+        }),
+      } as any;
+
+      const result = getServiceConfig(mockHeaders);
+
+      expect(result.serviceConfig.baseUrl).toBe("https://api.zitadel.cloud");
+      expect(result.serviceConfig.instanceHost).toBe("customer.zitadel.cloud");
+      expect(result.serviceConfig.publicHost).toBe("customer.zitadel.cloud");
+    });
+
+    test("should strip protocol from instanceHost and publicHost", () => {
+      process.env.ZITADEL_API_URL = "https://api.zitadel.cloud";
+
+      const mockHeaders = {
+        get: vi.fn((key: string) => {
+          if (key === "x-zitadel-forward-host") return "https://customer.zitadel.cloud";
+          if (key === "host") return "customer.zitadel.cloud";
+          return null;
+        }),
+      } as any;
+
+      const result = getServiceConfig(mockHeaders);
+
+      expect(result.serviceConfig.instanceHost).toBe("customer.zitadel.cloud");
+      expect(result.serviceConfig.publicHost).toBe("customer.zitadel.cloud");
+    });
+
+    test("should throw when host header is missing", () => {
+      process.env.ZITADEL_API_URL = "https://api.zitadel.cloud";
+
+      const mockHeaders = {
+        get: vi.fn((key: string) => {
+          if (key === "x-zitadel-forward-host") return null;
+          if (key === "host") return null;
+          return null;
+        }),
+      } as any;
+
+      expect(() => getServiceConfig(mockHeaders)).toThrow("No host found in headers");
+    });
+
+    test("should handle host with port number", () => {
+      process.env.ZITADEL_API_URL = "https://api.zitadel.cloud";
+
+      const mockHeaders = {
+        get: vi.fn((key: string) => {
+          if (key === "x-zitadel-forward-host") return "customer.zitadel.cloud:443";
+          if (key === "host") return "customer.zitadel.cloud:443";
+          return null;
+        }),
+      } as any;
+
+      const result = getServiceConfig(mockHeaders);
+
+      expect(result.serviceConfig.publicHost).toBe("customer.zitadel.cloud:443");
+    });
+  });
+
+  describe("constructUrl", () => {
+    test("should construct URL with x-zitadel-forward-host when present", () => {
+      process.env.NEXT_PUBLIC_BASE_PATH = "";
+      const mockRequest = {
+        headers: {
+          get: vi.fn((key: string) => {
+            if (key === "x-zitadel-forward-host") return "customer.zitadel.cloud";
+            if (key === "host") return "customer.zitadel.cloud";
+            return null;
+          }),
+        },
+        nextUrl: {
+          protocol: "https:",
+        },
+      } as any;
+
+      const result = constructUrl(mockRequest as NextRequest, "/test");
+
+      expect(result.hostname).toBe("customer.zitadel.cloud");
+      expect(result.pathname).toBe("/test");
+      expect(result.protocol).toBe("https:");
+    });
+
+    test("should fall back to x-forwarded-host when x-zitadel-forward-host is not present", () => {
+      process.env.NEXT_PUBLIC_BASE_PATH = "";
+      const mockRequest = {
+        headers: {
+          get: vi.fn((key: string) => {
+            if (key === "x-zitadel-forward-host") return null;
+            if (key === "x-forwarded-host") return "mycompany.com";
+            return null;
+          }),
+        },
+        nextUrl: {
+          protocol: "https:",
+        },
+      } as any;
+
+      const result = constructUrl(mockRequest as NextRequest, "/oauth/authorize");
+
+      expect(result.hostname).toBe("mycompany.com");
+      expect(result.pathname).toBe("/oauth/authorize");
+    });
+
+    test("should fall back to host header when no forwarded headers present", () => {
+      const mockRequest = {
+        headers: {
+          get: vi.fn((key: string) => {
+            if (key === "x-zitadel-forward-host") return null;
+            if (key === "x-forwarded-host") return null;
+            if (key === "host") return "localhost:3000";
+            return null;
+          }),
+        },
+        nextUrl: {
+          protocol: "http:",
+        },
+      } as any;
+
+      const result = constructUrl(mockRequest as NextRequest, "/test");
+
+      expect(result.hostname).toBe("localhost");
+      expect(result.port).toBe("3000");
+    });
+
+    test("should use protocol from nextUrl.protocol (not from headers)", () => {
+      const mockRequest = {
+        headers: {
+          get: vi.fn((key: string) => {
+            // Even if x-forwarded-proto is present, it should be ignored
+            if (key === "x-forwarded-proto") return "http";
+            if (key === "host") return "example.com";
+            return null;
+          }),
+        },
+        nextUrl: {
+          protocol: "https:", // This should be used
+        },
+      } as any;
+
+      const result = constructUrl(mockRequest as NextRequest, "/test");
+
+      // Should use https: from nextUrl.protocol, not http from header
+      expect(result.protocol).toBe("https:");
+    });
+
+    test("should include base path when NEXT_PUBLIC_BASE_PATH is set", () => {
+      process.env.NEXT_PUBLIC_BASE_PATH = "/login";
+
+      const mockRequest = {
+        headers: {
+          get: vi.fn((key: string) => {
+            if (key === "host") return "example.com";
+            return null;
+          }),
+        },
+        nextUrl: {
+          protocol: "https:",
+        },
+      } as any;
+
+      const result = constructUrl(mockRequest as NextRequest, "/test");
+
+      expect(result.pathname).toBe("/login/test");
+    });
+  });
+});

apps/login/src/lib/service-url.ts

@@ -1,58 +1,47 @@
 import { ReadonlyHeaders } from "next/dist/server/web/spec-extension/adapters/headers";
 import { NextRequest } from "next/server";
+import { ServiceConfig } from "./zitadel";
+import { getInstanceHost, getPublicHost } from "./server/host";
 
 /**
- * Extracts the service url and region from the headers if used in a multitenant context (host, x-zitadel-forward-host header)
+ * Extracts the service URL based on deployment mode and configuration.
- * or falls back to the ZITADEL_API_URL for a self hosting deployment
- * or falls back to the host header for a self hosting deployment using custom domains
- * @param headers
- * @returns the service url and region from the headers
- * @throws if the service url could not be determined
  *
+ * Priority:
+ * 1. ZITADEL_API_URL (required) - Used by both self-hosted and multi-tenant
+ * 2. x-zitadel-forward-host (multi-tenant only) - Set by Zitadel proxy
+ * 3. host header (multi-tenant fallback) - For dynamic host resolution
+ *
+ * @param headers - Request headers
+ * @returns Object containing the service Configuration
+ * @throws Error if the service Configuration could not be determined
  */
-export function getServiceUrlFromHeaders(headers: ReadonlyHeaders): {
-  serviceUrl: string;
-} {
-  let instanceUrl;
 
-  const forwardedHost = headers.get("x-zitadel-forward-host");
+function stripProtocol(url: string): string {
-  // use the forwarded host if available (multitenant), otherwise fall back to the host of the deployment itself
+  return url.replace(/^https?:\/\//, "");
-  if (forwardedHost) {
+}
-    instanceUrl = forwardedHost;
-    instanceUrl = instanceUrl.startsWith("http://")
-      ? instanceUrl
-      : `https://${instanceUrl}`;
-  } else if (process.env.ZITADEL_API_URL) {
-    instanceUrl = process.env.ZITADEL_API_URL;
-  } else {
-    const host = headers.get("host");
 
-    if (host) {
+export function getServiceConfig(headers: ReadonlyHeaders): { serviceConfig: ServiceConfig } {
-      const [hostname] = host.split(":");
+  if (!process.env.ZITADEL_API_URL) {
-      if (hostname !== "localhost") {
+    throw new Error("ZITADEL_API_URL is not set");
-        instanceUrl = host.startsWith("http") ? host : `https://${host}`;
-      }
-    }
   }
 
-  if (!instanceUrl) {
+  // use forwarded host from proxy - headers are forwarded to the APIs.
-    throw new Error("Service URL could not be determined");
+  const instanceHost = getInstanceHost(headers);
-  }
+  const publicHost = getPublicHost(headers);
 
   return {
-    serviceUrl: instanceUrl,
+    serviceConfig: {
+      baseUrl: process.env.ZITADEL_API_URL,
+      ...(instanceHost && { instanceHost: stripProtocol(instanceHost) }),
+      ...(publicHost && { publicHost: stripProtocol(publicHost) }),
+    },
   };
 }
 
 export function constructUrl(request: NextRequest, path: string) {
-  const forwardedProto = request.headers.get("x-forwarded-proto")
+  const protocol = request.nextUrl.protocol;
-    ? `${request.headers.get("x-forwarded-proto")}:`
-    : request.nextUrl.protocol;
 
-  const forwardedHost =
+  const forwardedHost = getPublicHost(request.headers);
-    request.headers.get("x-zitadel-forward-host") ??
-    request.headers.get("x-forwarded-host") ??
-    request.headers.get("host");
   const basePath = process.env.NEXT_PUBLIC_BASE_PATH || "";
-  return new URL(`${basePath}${path}`, `${forwardedProto}//${forwardedHost}`);
+  return new URL(`${basePath}${path}`, `${protocol}//${forwardedHost}`);
 }

apps/login/src/lib/service.ts

@@ -7,7 +7,8 @@ import { SessionService } from "@zitadel/proto/zitadel/session/v2/session_servic
 import { SettingsService } from "@zitadel/proto/zitadel/settings/v2/settings_service_pb";
 import { UserService } from "@zitadel/proto/zitadel/user/v2/user_service_pb";
 import { systemAPIToken } from "./api";
-import { createServerTransport } from "./zitadel";
+import { hasSystemUserCredentials, hasServiceUserToken } from "./deployment";
+import { createServerTransport, ServiceConfig } from "./zitadel";
 
 type ServiceClass =
   | typeof IdentityProviderService
@@ -18,32 +19,27 @@ type ServiceClass =
   | typeof SettingsService
   | typeof SAMLService;
 
-export async function createServiceForHost<T extends ServiceClass>(
+export async function createServiceForHost<T extends ServiceClass>(service: T, serviceConfig: ServiceConfig) {
-  service: T,
-  serviceUrl: string,
-) {
   let token;
 
-  // if we are running in a multitenancy context, use the system user token
+  // Determine authentication method based on available credentials
-  if (
+  // Prefer system user JWT if available, fallback to service user token
-    process.env.AUDIENCE &&
+  if (hasSystemUserCredentials()) {
-    process.env.SYSTEM_USER_ID &&
-    process.env.SYSTEM_USER_PRIVATE_KEY
-  ) {
     token = await systemAPIToken();
-  } else if (process.env.ZITADEL_SERVICE_USER_TOKEN) {
+  } else if (hasServiceUserToken()) {
+    // Use service user token authentication (self-hosted)
     token = process.env.ZITADEL_SERVICE_USER_TOKEN;
+  } else {
+    throw new Error(
+      "No authentication credentials found. Set either system user credentials (AUDIENCE, SYSTEM_USER_ID, SYSTEM_USER_PRIVATE_KEY) or ZITADEL_SERVICE_USER_TOKEN",
+    );
   }
 
-  if (!serviceUrl) {
+  if (!serviceConfig) {
-    throw new Error("No instance url found");
+    throw new Error("No service config found");
   }
 
-  if (!token) {
+  const transport = createServerTransport(token, serviceConfig);
-    throw new Error("No token found");
-  }
-
-  const transport = createServerTransport(token, serviceUrl);
 
   return createClientFor<T>(service)(transport);
 }

apps/login/src/lib/session.test.ts

@@ -101,7 +101,7 @@ describe("isSessionValid", () => {
         factors: undefined,
       });
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(false);
       expect(consoleSpy).toHaveBeenCalledWith("Session has no user");
@@ -120,7 +120,7 @@ describe("isSessionValid", () => {
         authMethodTypes: [],
       } as any);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(false);
       expect(consoleSpy).toHaveBeenCalledWith("Session is expired", expect.any(String));
@@ -147,7 +147,7 @@ describe("isSessionValid", () => {
         authMethodTypes: [],
       } as any);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(false);
     });
@@ -179,7 +179,7 @@ describe("isSessionValid", () => {
         forceMfaLocalOnly: false,
       } as any);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(true);
     });
@@ -207,7 +207,7 @@ describe("isSessionValid", () => {
         forceMfaLocalOnly: false,
       } as any);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(true);
     });
@@ -242,7 +242,7 @@ describe("isSessionValid", () => {
 
       vi.mocked(verifyHelperModule.shouldEnforceMFA).mockReturnValue(true);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(false);
       expect(consoleSpy).toHaveBeenCalledWith(
@@ -278,7 +278,7 @@ describe("isSessionValid", () => {
         authMethodTypes: [AuthenticationMethodType.OTP_EMAIL],
       } as any);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(true);
     });
@@ -307,7 +307,7 @@ describe("isSessionValid", () => {
         authMethodTypes: [AuthenticationMethodType.U2F],
       } as any);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(true);
     });
@@ -342,7 +342,7 @@ describe("isSessionValid", () => {
         authMethodTypes: [AuthenticationMethodType.TOTP, AuthenticationMethodType.OTP_EMAIL],
       } as any);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(true);
     });
@@ -372,7 +372,7 @@ describe("isSessionValid", () => {
 
       vi.mocked(verifyHelperModule.shouldEnforceMFA).mockReturnValue(false);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(true);
     });
@@ -409,7 +409,7 @@ describe("isSessionValid", () => {
 
       vi.mocked(verifyHelperModule.shouldEnforceMFA).mockReturnValue(false);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(true);
     });
@@ -447,7 +447,7 @@ describe("isSessionValid", () => {
 
       vi.mocked(verifyHelperModule.shouldEnforceMFA).mockReturnValue(true);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(false);
       expect(consoleSpy).toHaveBeenCalledWith(
@@ -499,7 +499,7 @@ describe("isSessionValid", () => {
 
       vi.mocked(verifyHelperModule.shouldEnforceMFA).mockReturnValue(false);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       // This should be true - if it's false, the original bug still exists
       expect(result).toBe(true);
@@ -539,7 +539,7 @@ describe("isSessionValid", () => {
 
       vi.mocked(verifyHelperModule.shouldEnforceMFA).mockReturnValue(false);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       // With our fix, this should be true (session is valid)
       // With the old logic, this would have been false (bug)
@@ -576,7 +576,7 @@ describe("isSessionValid", () => {
 
       vi.mocked(verifyHelperModule.shouldEnforceMFA).mockReturnValue(false);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(true);
     });
@@ -611,7 +611,7 @@ describe("isSessionValid", () => {
 
       vi.mocked(verifyHelperModule.shouldEnforceMFA).mockReturnValue(true);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(false);
       expect(consoleSpy).toHaveBeenCalledWith("Session has no valid multifactor", expect.any(Object));
@@ -647,7 +647,7 @@ describe("isSessionValid", () => {
         forceMfaLocalOnly: false,
       } as any);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(true);
     });
@@ -681,7 +681,7 @@ describe("isSessionValid", () => {
         forceMfaLocalOnly: true,
       } as any);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(true);
     });
@@ -716,15 +716,15 @@ describe("isSessionValid", () => {
 
       vi.mocked(verifyHelperModule.shouldEnforceMFA).mockReturnValue(true);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(false);
       expect(zitadelModule.getLoginSettings).toHaveBeenCalledWith({
-        serviceUrl: mockServiceUrl,
+        serviceConfig: { baseUrl: mockServiceUrl },
         organization: mockOrganizationId,
       });
       expect(zitadelModule.listAuthenticationMethodTypes).toHaveBeenCalledWith({
-        serviceUrl: mockServiceUrl,
+        serviceConfig: { baseUrl: mockServiceUrl },
         userId: mockUserId,
       });
       consoleSpy.mockRestore();
@@ -777,7 +777,7 @@ describe("isSessionValid", () => {
         },
       } as any);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(false);
       expect(consoleSpy).toHaveBeenCalledWith(
@@ -831,7 +831,7 @@ describe("isSessionValid", () => {
         },
       } as any);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(true);
     });
@@ -866,7 +866,7 @@ describe("isSessionValid", () => {
 
       vi.mocked(verifyHelperModule.shouldEnforceMFA).mockReturnValue(false);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(true);
       // getUserByID should not be called when EMAIL_VERIFICATION is disabled
@@ -902,7 +902,7 @@ describe("isSessionValid", () => {
         forceMfaLocalOnly: false,
       } as any);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(true);
     });
@@ -938,12 +938,12 @@ describe("isSessionValid", () => {
         authMethodTypes: [],
       } as any);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(true);
       expect(verifyHelperModule.shouldEnforceMFA).toHaveBeenCalledWith(session, expect.any(Object));
       expect(zitadelModule.getLoginSettings).toHaveBeenCalledWith({
-        serviceUrl: mockServiceUrl,
+        serviceConfig: { baseUrl: mockServiceUrl },
         organization: mockOrganizationId,
       });
     });
@@ -979,16 +979,16 @@ describe("isSessionValid", () => {
         authMethodTypes: [AuthenticationMethodType.TOTP, AuthenticationMethodType.OTP_EMAIL],
       } as any);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(false);
       expect(verifyHelperModule.shouldEnforceMFA).toHaveBeenCalledWith(session, expect.any(Object));
       expect(zitadelModule.getLoginSettings).toHaveBeenCalledWith({
-        serviceUrl: mockServiceUrl,
+        serviceConfig: { baseUrl: mockServiceUrl },
         organization: mockOrganizationId,
       });
       expect(zitadelModule.listAuthenticationMethodTypes).toHaveBeenCalledWith({
-        serviceUrl: mockServiceUrl,
+        serviceConfig: { baseUrl: mockServiceUrl },
         userId: mockUserId,
       });
     });
@@ -1024,12 +1024,12 @@ describe("isSessionValid", () => {
         authMethodTypes: [AuthenticationMethodType.TOTP, AuthenticationMethodType.OTP_EMAIL],
       } as any);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(true);
       expect(verifyHelperModule.shouldEnforceMFA).toHaveBeenCalledWith(session, expect.any(Object));
       expect(zitadelModule.getLoginSettings).toHaveBeenCalledWith({
-        serviceUrl: mockServiceUrl,
+        serviceConfig: { baseUrl: mockServiceUrl },
         organization: mockOrganizationId,
       });
       // Should not call listAuthenticationMethodTypes since shouldEnforceMFA returned false
@@ -1067,7 +1067,7 @@ describe("isSessionValid", () => {
         authMethodTypes: [AuthenticationMethodType.TOTP],
       } as any);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(true);
     });
@@ -1105,12 +1105,12 @@ describe("isSessionValid", () => {
         authMethodTypes: [AuthenticationMethodType.TOTP],
       } as any);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(true);
       expect(verifyHelperModule.shouldEnforceMFA).toHaveBeenCalledWith(session, expect.any(Object));
       expect(zitadelModule.getLoginSettings).toHaveBeenCalledWith({
-        serviceUrl: mockServiceUrl,
+        serviceConfig: { baseUrl: mockServiceUrl },
         organization: mockOrganizationId,
       });
       // Should not call listAuthenticationMethodTypes since shouldEnforceMFA returned false
@@ -1146,7 +1146,7 @@ describe("isSessionValid", () => {
         forceMfaLocalOnly: false,
       } as any);
 
-      const result = await isSessionValid({ serviceUrl: mockServiceUrl, session });
+      const result = await isSessionValid({ serviceConfig: { baseUrl: mockServiceUrl }, session });
 
       expect(result).toBe(true);
     });

apps/login/src/lib/session.ts

@@ -6,37 +6,30 @@ import { GetSessionResponse } from "@zitadel/proto/zitadel/session/v2/session_se
 import { AuthenticationMethodType } from "@zitadel/proto/zitadel/user/v2/user_service_pb";
 import { getMostRecentCookieWithLoginname } from "./cookies";
 import { shouldEnforceMFA } from "./verify-helper";
-import { getLoginSettings, getSession, getUserByID, listAuthenticationMethodTypes } from "./zitadel";
+import { getLoginSettings, getSession, getUserByID, listAuthenticationMethodTypes, ServiceConfig } from "./zitadel";
 
 type LoadMostRecentSessionParams = {
-  serviceUrl: string;
+  serviceConfig: ServiceConfig;
   sessionParams: {
     loginName?: string;
     organization?: string;
   };
 };
 
-export async function loadMostRecentSession({
+export async function loadMostRecentSession({ serviceConfig, sessionParams }: LoadMostRecentSessionParams): Promise<Session | undefined> {
-  serviceUrl,
-  sessionParams,
-}: LoadMostRecentSessionParams): Promise<Session | undefined> {
   const recent = await getMostRecentCookieWithLoginname({
     loginName: sessionParams.loginName,
     organization: sessionParams.organization,
   });
 
-  return getSession({
+  return getSession({ serviceConfig, sessionId: recent.id, sessionToken: recent.token }).then((resp: GetSessionResponse) => resp.session);
-    serviceUrl,
-    sessionId: recent.id,
-    sessionToken: recent.token,
-  }).then((resp: GetSessionResponse) => resp.session);
 }
 
 /**
  * mfa is required, session is not valid anymore (e.g. session expired, user logged out, etc.)
  * to check for mfa for automatically selected session -> const response = await listAuthenticationMethodTypes(userId);
  **/
-export async function isSessionValid({ serviceUrl, session }: { serviceUrl: string; session: Session }): Promise<boolean> {
+export async function isSessionValid({ serviceConfig, session }: { serviceConfig: ServiceConfig; session: Session }): Promise<boolean> {
   // session can't be checked without user
   if (!session.factors?.user) {
     console.warn("Session has no user");
@@ -51,20 +44,14 @@ export async function isSessionValid({ serviceUrl, session }: { serviceUrl: stri
   const validPasskey = session?.factors?.webAuthN?.verifiedAt;
 
   // Get login settings to determine if MFA is actually required by policy
-  const loginSettings = await getLoginSettings({
+  const loginSettings = await getLoginSettings({ serviceConfig, organization: session.factors?.user?.organizationId });
-    serviceUrl,
-    organization: session.factors?.user?.organizationId,
-  });
 
   // Use the existing shouldEnforceMFA function to determine if MFA is required
   const isMfaRequired = shouldEnforceMFA(session, loginSettings);
 
   // Only enforce MFA validation if MFA is required by policy
   if (isMfaRequired) {
-    const authMethodTypes = await listAuthenticationMethodTypes({
+    const authMethodTypes = await listAuthenticationMethodTypes({ serviceConfig, userId: session.factors.user.id });
-      serviceUrl,
-      userId: session.factors.user.id,
-    });
 
     const authMethods = authMethodTypes.authMethodTypes;
     // Filter to only MFA methods (exclude PASSWORD and PASSKEY)
@@ -134,10 +121,7 @@ export async function isSessionValid({ serviceUrl, session }: { serviceUrl: stri
 
   // Check email verification if EMAIL_VERIFICATION environment variable is enabled
   if (process.env.EMAIL_VERIFICATION === "true") {
-    const userResponse = await getUserByID({
+    const userResponse = await getUserByID({ serviceConfig, userId: session.factors.user.id });
-      serviceUrl,
-      userId: session.factors.user.id,
-    });
 
     const humanUser = userResponse?.user?.type.case === "human" ? userResponse?.user.type.value : undefined;
 
@@ -151,12 +135,12 @@ export async function isSessionValid({ serviceUrl, session }: { serviceUrl: stri
 }
 
 export async function findValidSession({
-  serviceUrl,
+  serviceConfig,
   sessions,
   authRequest,
   samlRequest,
 }: {
-  serviceUrl: string;
+  serviceConfig: ServiceConfig;
   sessions: Session[];
   authRequest?: AuthRequest;
   samlRequest?: SAMLRequest;
@@ -189,7 +173,7 @@ export async function findValidSession({
 
   // return the first valid session according to settings
   for (const session of sessionsWithHint) {
-    if (await isSessionValid({ serviceUrl, session })) {
+    if (await isSessionValid({ serviceConfig, session })) {
       return session;
     }
   }

apps/login/src/lib/verify-helper.ts

@@ -8,7 +8,7 @@ import crypto from "crypto";
 import moment from "moment";
 import { cookies } from "next/headers";
 import { getFingerprintIdCookie } from "./fingerprint";
-import { getUserByID } from "./zitadel";
+import { getUserByID, ServiceConfig } from "./zitadel";
 
 export function checkPasswordChangeRequired(
   expirySettings: PasswordExpirySettings | undefined,
@@ -82,7 +82,7 @@ export function checkEmailVerification(session: Session, humanUser?: HumanUser,
 }
 
 export async function checkMFAFactors(
-  serviceUrl: string,
+  serviceConfig: ServiceConfig,
   session: Session,
   loginSettings: LoginSettings | undefined,
   authMethods: AuthenticationMethodType[],
@@ -179,10 +179,7 @@ export async function checkMFAFactors(
     session?.factors?.user?.id &&
     shouldEnforceMFA(session, loginSettings)
   ) {
-    const userResponse = await getUserByID({
+    const userResponse = await getUserByID({ serviceConfig, userId: session.factors?.user?.id });
-      serviceUrl,
-      userId: session.factors?.user?.id,
-    });
 
     const humanUser = userResponse?.user?.type.case === "human" ? userResponse?.user.type.value : undefined;
 

apps/login/src/lib/zitadel.ts

@@ -45,15 +45,14 @@ async function cacheWrapper<T>(callback: Promise<T>) {
 }
 
 export async function getHostedLoginTranslation({
-  serviceUrl,
+  serviceConfig,
   organization,
   locale,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   organization?: string;
   locale?: string;
-}) {
+}>) {
-  const settingsService: Client<typeof SettingsService> = await createServiceForHost(SettingsService, serviceUrl);
+  const settingsService: Client<typeof SettingsService> = await createServiceForHost(SettingsService, serviceConfig);
 
   const callback = settingsService
     .getHostedLoginTranslation(
@@ -78,8 +77,13 @@ export async function getHostedLoginTranslation({
   return useCache ? cacheWrapper(callback) : callback;
 }
 
-export async function getBrandingSettings({ serviceUrl, organization }: { serviceUrl: string; organization?: string }) {
+export async function getBrandingSettings({
-  const settingsService: Client<typeof SettingsService> = await createServiceForHost(SettingsService, serviceUrl);
+  serviceConfig,
+  organization,
+}: WithServiceConfig<{
+  organization?: string;
+}>) {
+  const settingsService: Client<typeof SettingsService> = await createServiceForHost(SettingsService, serviceConfig);
 
   const callback = settingsService
     .getBrandingSettings({ ctx: makeReqCtx(organization) }, {})
@@ -88,8 +92,13 @@ export async function getBrandingSettings({ serviceUrl, organization }: { servic
   return useCache ? cacheWrapper(callback) : callback;
 }
 
-export async function getLoginSettings({ serviceUrl, organization }: { serviceUrl: string; organization?: string }) {
+export async function getLoginSettings({
-  const settingsService: Client<typeof SettingsService> = await createServiceForHost(SettingsService, serviceUrl);
+  serviceConfig,
+  organization,
+}: WithServiceConfig<{
+  organization?: string;
+}>) {
+  const settingsService: Client<typeof SettingsService> = await createServiceForHost(SettingsService, serviceConfig);
 
   const callback = settingsService
     .getLoginSettings({ ctx: makeReqCtx(organization) }, {})
@@ -98,16 +107,16 @@ export async function getLoginSettings({ serviceUrl, organization }: { serviceUr
   return useCache ? cacheWrapper(callback) : callback;
 }
 
-export async function getSecuritySettings({ serviceUrl }: { serviceUrl: string }) {
+export async function getSecuritySettings({ serviceConfig }: WithServiceConfig) {
-  const settingsService: Client<typeof SettingsService> = await createServiceForHost(SettingsService, serviceUrl);
+  const settingsService: Client<typeof SettingsService> = await createServiceForHost(SettingsService, serviceConfig);
 
   const callback = settingsService.getSecuritySettings({}).then((resp) => (resp.settings ? resp.settings : undefined));
 
   return useCache ? cacheWrapper(callback) : callback;
 }
 
-export async function getLockoutSettings({ serviceUrl, orgId }: { serviceUrl: string; orgId?: string }) {
+export async function getLockoutSettings({ serviceConfig, orgId }: WithServiceConfig<{ orgId?: string }>) {
-  const settingsService: Client<typeof SettingsService> = await createServiceForHost(SettingsService, serviceUrl);
+  const settingsService: Client<typeof SettingsService> = await createServiceForHost(SettingsService, serviceConfig);
 
   const callback = settingsService
     .getLockoutSettings({ ctx: makeReqCtx(orgId) }, {})
@@ -116,8 +125,8 @@ export async function getLockoutSettings({ serviceUrl, orgId }: { serviceUrl: st
   return useCache ? cacheWrapper(callback) : callback;
 }
 
-export async function getPasswordExpirySettings({ serviceUrl, orgId }: { serviceUrl: string; orgId?: string }) {
+export async function getPasswordExpirySettings({ serviceConfig, orgId }: WithServiceConfig<{ orgId?: string }>) {
-  const settingsService: Client<typeof SettingsService> = await createServiceForHost(SettingsService, serviceUrl);
+  const settingsService: Client<typeof SettingsService> = await createServiceForHost(SettingsService, serviceConfig);
 
   const callback = settingsService
     .getPasswordExpirySettings({ ctx: makeReqCtx(orgId) }, {})
@@ -126,32 +135,32 @@ export async function getPasswordExpirySettings({ serviceUrl, orgId }: { service
   return useCache ? cacheWrapper(callback) : callback;
 }
 
-export async function listIDPLinks({ serviceUrl, userId }: { serviceUrl: string; userId: string }) {
+export async function listIDPLinks({ serviceConfig, userId }: WithServiceConfig<{ userId: string }>) {
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.listIDPLinks({ userId }, {});
 }
 
-export async function addOTPEmail({ serviceUrl, userId }: { serviceUrl: string; userId: string }) {
+export async function addOTPEmail({ serviceConfig, userId }: WithServiceConfig<{ userId: string }>) {
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.addOTPEmail({ userId }, {});
 }
 
-export async function addOTPSMS({ serviceUrl, userId }: { serviceUrl: string; userId: string }) {
+export async function addOTPSMS({ serviceConfig, userId }: WithServiceConfig<{ userId: string }>) {
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.addOTPSMS({ userId }, {});
 }
 
-export async function registerTOTP({ serviceUrl, userId }: { serviceUrl: string; userId: string }) {
+export async function registerTOTP({ serviceConfig, userId }: WithServiceConfig<{ userId: string }>) {
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.registerTOTP({ userId }, {});
 }
 
-export async function getGeneralSettings({ serviceUrl }: { serviceUrl: string }) {
+export async function getGeneralSettings({ serviceConfig }: WithServiceConfig) {
-  const settingsService: Client<typeof SettingsService> = await createServiceForHost(SettingsService, serviceUrl);
+  const settingsService: Client<typeof SettingsService> = await createServiceForHost(SettingsService, serviceConfig);
 
   const callback = settingsService.getGeneralSettings({}, {}).then((resp) => resp.supportedLanguages);
 
@@ -159,13 +168,12 @@ export async function getGeneralSettings({ serviceUrl }: { serviceUrl: string })
 }
 
 export async function getLegalAndSupportSettings({
-  serviceUrl,
+  serviceConfig,
   organization,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   organization?: string;
-}) {
+}>) {
-  const settingsService: Client<typeof SettingsService> = await createServiceForHost(SettingsService, serviceUrl);
+  const settingsService: Client<typeof SettingsService> = await createServiceForHost(SettingsService, serviceConfig);
 
   const callback = settingsService
     .getLegalAndSupportSettings({ ctx: makeReqCtx(organization) }, {})
@@ -175,13 +183,12 @@ export async function getLegalAndSupportSettings({
 }
 
 export async function getPasswordComplexitySettings({
-  serviceUrl,
+  serviceConfig,
   organization,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   organization?: string;
-}) {
+}>) {
-  const settingsService: Client<typeof SettingsService> = await createServiceForHost(SettingsService, serviceUrl);
+  const settingsService: Client<typeof SettingsService> = await createServiceForHost(SettingsService, serviceConfig);
 
   const callback = settingsService
     .getPasswordComplexitySettings({ ctx: makeReqCtx(organization) })
@@ -191,15 +198,14 @@ export async function getPasswordComplexitySettings({
 }
 
 export async function createSessionFromChecks({
-  serviceUrl,
+  serviceConfig,
   checks,
   lifetime,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   checks: Checks;
   lifetime: Duration;
-}) {
+}>) {
-  const sessionService: Client<typeof SessionService> = await createServiceForHost(SessionService, serviceUrl);
+  const sessionService: Client<typeof SessionService> = await createServiceForHost(SessionService, serviceConfig);
 
   const userAgent = await getUserAgent();
 
@@ -207,21 +213,20 @@ export async function createSessionFromChecks({
 }
 
 export async function createSessionForUserIdAndIdpIntent({
-  serviceUrl,
+  serviceConfig,
   userId,
   idpIntent,
   lifetime,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   userId: string;
   idpIntent: {
     idpIntentId?: string | undefined;
     idpIntentToken?: string | undefined;
   };
   lifetime: Duration;
-}) {
+}>) {
   console.log("Creating session for userId and IDP intent", { userId, idpIntent, lifetime });
-  const sessionService: Client<typeof SessionService> = await createServiceForHost(SessionService, serviceUrl);
+  const sessionService: Client<typeof SessionService> = await createServiceForHost(SessionService, serviceConfig);
 
   const userAgent = await getUserAgent();
 
@@ -241,21 +246,20 @@ export async function createSessionForUserIdAndIdpIntent({
 }
 
 export async function setSession({
-  serviceUrl,
+  serviceConfig,
   sessionId,
   sessionToken,
   challenges,
   checks,
   lifetime,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   sessionId: string;
   sessionToken: string;
   challenges: RequestChallenges | undefined;
   checks?: Checks;
   lifetime: Duration;
-}) {
+}>) {
-  const sessionService: Client<typeof SessionService> = await createServiceForHost(SessionService, serviceUrl);
+  const sessionService: Client<typeof SessionService> = await createServiceForHost(SessionService, serviceConfig);
 
   return sessionService.setSession(
     {
@@ -271,40 +275,37 @@ export async function setSession({
 }
 
 export async function getSession({
-  serviceUrl,
+  serviceConfig,
   sessionId,
   sessionToken,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   sessionId: string;
   sessionToken: string;
-}) {
+}>) {
-  const sessionService: Client<typeof SessionService> = await createServiceForHost(SessionService, serviceUrl);
+  const sessionService: Client<typeof SessionService> = await createServiceForHost(SessionService, serviceConfig);
 
   return sessionService.getSession({ sessionId, sessionToken }, {});
 }
 
 export async function deleteSession({
-  serviceUrl,
+  serviceConfig,
   sessionId,
   sessionToken,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   sessionId: string;
   sessionToken: string;
-}) {
+}>) {
-  const sessionService: Client<typeof SessionService> = await createServiceForHost(SessionService, serviceUrl);
+  const sessionService: Client<typeof SessionService> = await createServiceForHost(SessionService, serviceConfig);
 
   return sessionService.deleteSession({ sessionId, sessionToken }, {});
 }
 
-type ListSessionsCommand = {
+type ListSessionsCommand = WithServiceConfig<{
-  serviceUrl: string;
   ids: string[];
-};
+}>;
 
-export async function listSessions({ serviceUrl, ids }: ListSessionsCommand) {
+export async function listSessions({ serviceConfig, ids }: ListSessionsCommand) {
-  const sessionService: Client<typeof SessionService> = await createServiceForHost(SessionService, serviceUrl);
+  const sessionService: Client<typeof SessionService> = await createServiceForHost(SessionService, serviceConfig);
 
   return sessionService.listSessions(
     {
@@ -321,17 +322,16 @@ export async function listSessions({ serviceUrl, ids }: ListSessionsCommand) {
   );
 }
 
-export type AddHumanUserData = {
+export type AddHumanUserData = WithServiceConfig<{
-  serviceUrl: string;
   firstName: string;
   lastName: string;
   email: string;
   password?: string;
   organization: string;
-};
+}>;
 
-export async function addHumanUser({ serviceUrl, email, firstName, lastName, password, organization }: AddHumanUserData) {
+export async function addHumanUser({ serviceConfig, email, firstName, lastName, password, organization }: AddHumanUserData) {
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   let addHumanUserRequest: AddHumanUserRequest = create(AddHumanUserRequestSchema, {
     email: {
@@ -360,67 +360,69 @@ export async function addHumanUser({ serviceUrl, email, firstName, lastName, pas
   return userService.addHumanUser(addHumanUserRequest);
 }
 
-export async function addHuman({ serviceUrl, request }: { serviceUrl: string; request: AddHumanUserRequest }) {
+export async function addHuman({ serviceConfig, request }: WithServiceConfig<{ request: AddHumanUserRequest }>) {
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.addHumanUser(request);
 }
 
-export async function updateHuman({ serviceUrl, request }: { serviceUrl: string; request: UpdateHumanUserRequest }) {
+export async function updateHuman({
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  serviceConfig,
+  request,
+}: WithServiceConfig<{
+  request: UpdateHumanUserRequest;
+}>) {
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.updateHumanUser(request);
 }
 
 export async function verifyTOTPRegistration({
-  serviceUrl,
+  serviceConfig,
   code,
   userId,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   code: string;
   userId: string;
-}) {
+}>) {
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.verifyTOTPRegistration({ code, userId }, {});
 }
 
-export async function getUserByID({ serviceUrl, userId }: { serviceUrl: string; userId: string }) {
+export async function getUserByID({ serviceConfig, userId }: WithServiceConfig<{ userId: string }>) {
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.getUserByID({ userId }, {});
 }
 
-export async function humanMFAInitSkipped({ serviceUrl, userId }: { serviceUrl: string; userId: string }) {
+export async function humanMFAInitSkipped({ serviceConfig, userId }: WithServiceConfig<{ userId: string }>) {
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.humanMFAInitSkipped({ userId }, {});
 }
 
 export async function verifyInviteCode({
-  serviceUrl,
+  serviceConfig,
   userId,
   verificationCode,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   userId: string;
   verificationCode: string;
-}) {
+}>) {
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.verifyInviteCode({ userId, verificationCode }, {});
 }
 
 export async function sendEmailCode({
-  serviceUrl,
+  serviceConfig,
   userId,
   urlTemplate,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   userId: string;
   urlTemplate: string;
-}) {
+}>) {
   let medium = create(SendEmailCodeRequestSchema, { userId });
 
   medium = create(SendEmailCodeRequestSchema, {
@@ -433,20 +435,19 @@ export async function sendEmailCode({
     },
   });
 
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.sendEmailCode(medium, {});
 }
 
 export async function createInviteCode({
-  serviceUrl,
+  serviceConfig,
   urlTemplate,
   userId,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   urlTemplate: string;
   userId: string;
-}) {
+}>) {
   let medium = create(SendInviteCodeSchema, {
     applicationName: process.env.NEXT_PUBLIC_APPLICATION_NAME || "Zitadel Login",
   });
@@ -456,7 +457,7 @@ export async function createInviteCode({
     urlTemplate,
   };
 
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.createInviteCode(
     {
@@ -470,16 +471,15 @@ export async function createInviteCode({
   );
 }
 
-export type ListUsersCommand = {
+export type ListUsersCommand = WithServiceConfig<{
-  serviceUrl: string;
   loginName?: string;
   userName?: string;
   email?: string;
   phone?: string;
   organizationId?: string;
-};
+}>;
 
-export async function listUsers({ serviceUrl, loginName, userName, phone, email, organizationId }: ListUsersCommand) {
+export async function listUsers({ serviceConfig, loginName, userName, phone, email, organizationId }: ListUsersCommand) {
   const queries: SearchQuery[] = [];
 
   // either use loginName or userName, email, phone
@@ -562,18 +562,17 @@ export async function listUsers({ serviceUrl, loginName, userName, phone, email,
     );
   }
 
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.listUsers({ queries });
 }
 
-export type SearchUsersCommand = {
+export type SearchUsersCommand = WithServiceConfig<{
-  serviceUrl: string;
   searchValue: string;
   loginSettings: LoginSettings;
   organizationId?: string;
   suffix?: string;
-};
+}>;
 
 const PhoneQuery = (searchValue: string) =>
   create(SearchQuerySchema, {
@@ -612,7 +611,13 @@ const EmailQuery = (searchValue: string) =>
  * this is a dedicated search function to search for users from the loginname page
  * it searches users based on the loginName or userName and org suffix combination, and falls back to email and phone if no users are found
  *  */
-export async function searchUsers({ serviceUrl, searchValue, loginSettings, organizationId, suffix }: SearchUsersCommand) {
+export async function searchUsers({
+  serviceConfig,
+  searchValue,
+  loginSettings,
+  organizationId,
+  suffix,
+}: SearchUsersCommand) {
   const queries: SearchQuery[] = [];
 
   const t = await getTranslations("zitadel");
@@ -640,7 +645,7 @@ export async function searchUsers({ serviceUrl, searchValue, loginSettings, orga
     );
   }
 
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   const loginNameResult = await userService.listUsers({ queries });
 
@@ -723,8 +728,8 @@ export async function searchUsers({ serviceUrl, searchValue, loginSettings, orga
   return { result: [] };
 }
 
-export async function getDefaultOrg({ serviceUrl }: { serviceUrl: string }): Promise<Organization | null> {
+export async function getDefaultOrg({ serviceConfig }: WithServiceConfig): Promise<Organization | null> {
-  const orgService: Client<typeof OrganizationService> = await createServiceForHost(OrganizationService, serviceUrl);
+  const orgService: Client<typeof OrganizationService> = await createServiceForHost(OrganizationService, serviceConfig);
 
   return orgService
     .listOrganizations(
@@ -743,8 +748,8 @@ export async function getDefaultOrg({ serviceUrl }: { serviceUrl: string }): Pro
     .then((resp) => (resp?.result && resp.result[0] ? resp.result[0] : null));
 }
 
-export async function getOrgsByDomain({ serviceUrl, domain }: { serviceUrl: string; domain: string }) {
+export async function getOrgsByDomain({ serviceConfig, domain }: WithServiceConfig<{ domain: string }>) {
-  const orgService: Client<typeof OrganizationService> = await createServiceForHost(OrganizationService, serviceUrl);
+  const orgService: Client<typeof OrganizationService> = await createServiceForHost(OrganizationService, serviceConfig);
 
   return orgService.listOrganizations(
     {
@@ -762,15 +767,15 @@ export async function getOrgsByDomain({ serviceUrl, domain }: { serviceUrl: stri
 }
 
 export async function startIdentityProviderFlow({
-  serviceUrl,
+  serviceConfig,
   idpId,
   urls,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   idpId: string;
   urls: RedirectURLsJson;
-}): Promise<string | null> {
+}>): Promise<string | null> {
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+    // Use empty publicHost to avoid issues with redirect URIs pointing to the login UI instead of the zitadel API
+    const userService: Client<typeof UserService> = await createServiceForHost(UserService, {...serviceConfig, publicHost: ''});
 
   return userService
     .startIdentityProviderIntent({
@@ -823,17 +828,16 @@ export async function startIdentityProviderFlow({
 }
 
 export async function startLDAPIdentityProviderFlow({
-  serviceUrl,
+  serviceConfig,
   idpId,
   username,
   password,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   idpId: string;
   username: string;
   password: string;
-}) {
+}>) {
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.startIdentityProviderIntent({
     idpId,
@@ -847,16 +851,26 @@ export async function startLDAPIdentityProviderFlow({
   });
 }
 
-export async function getAuthRequest({ serviceUrl, authRequestId }: { serviceUrl: string; authRequestId: string }) {
+export async function getAuthRequest({
-  const oidcService = await createServiceForHost(OIDCService, serviceUrl);
+  serviceConfig,
+  authRequestId,
+}: WithServiceConfig<{
+  authRequestId: string;
+}>) {
+  const oidcService = await createServiceForHost(OIDCService, serviceConfig);
 
   return oidcService.getAuthRequest({
     authRequestId,
   });
 }
 
-export async function getDeviceAuthorizationRequest({ serviceUrl, userCode }: { serviceUrl: string; userCode: string }) {
+export async function getDeviceAuthorizationRequest({
-  const oidcService = await createServiceForHost(OIDCService, serviceUrl);
+  serviceConfig,
+  userCode,
+}: WithServiceConfig<{
+  userCode: string;
+}>) {
+  const oidcService = await createServiceForHost(OIDCService, serviceConfig);
 
   return oidcService.getDeviceAuthorizationRequest({
     userCode,
@@ -864,15 +878,14 @@ export async function getDeviceAuthorizationRequest({ serviceUrl, userCode }: {
 }
 
 export async function authorizeOrDenyDeviceAuthorization({
-  serviceUrl,
+  serviceConfig,
   deviceAuthorizationId,
   session,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   deviceAuthorizationId: string;
   session?: { sessionId: string; sessionToken: string };
-}) {
+}>) {
-  const oidcService = await createServiceForHost(OIDCService, serviceUrl);
+  const oidcService = await createServiceForHost(OIDCService, serviceConfig);
 
   return oidcService.authorizeOrDenyDeviceAuthorization({
     deviceAuthorizationId,
@@ -888,36 +901,40 @@ export async function authorizeOrDenyDeviceAuthorization({
   });
 }
 
-export async function createCallback({ serviceUrl, req }: { serviceUrl: string; req: CreateCallbackRequest }) {
+export async function createCallback({ serviceConfig, req }: WithServiceConfig<{ req: CreateCallbackRequest }>) {
-  const oidcService = await createServiceForHost(OIDCService, serviceUrl);
+  const oidcService = await createServiceForHost(OIDCService, serviceConfig);
 
   return oidcService.createCallback(req);
 }
 
-export async function getSAMLRequest({ serviceUrl, samlRequestId }: { serviceUrl: string; samlRequestId: string }) {
+export async function getSAMLRequest({
-  const samlService = await createServiceForHost(SAMLService, serviceUrl);
+  serviceConfig,
+  samlRequestId,
+}: WithServiceConfig<{
+  samlRequestId: string;
+}>) {
+  const samlService = await createServiceForHost(SAMLService, serviceConfig);
 
   return samlService.getSAMLRequest({
     samlRequestId,
   });
 }
 
-export async function createResponse({ serviceUrl, req }: { serviceUrl: string; req: CreateResponseRequest }) {
+export async function createResponse({ serviceConfig, req }: WithServiceConfig<{ req: CreateResponseRequest }>) {
-  const samlService = await createServiceForHost(SAMLService, serviceUrl);
+  const samlService = await createServiceForHost(SAMLService, serviceConfig);
 
   return samlService.createResponse(req);
 }
 
 export async function verifyEmail({
-  serviceUrl,
+  serviceConfig,
   userId,
   verificationCode,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   userId: string;
   verificationCode: string;
-}) {
+}>) {
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.verifyEmail(
     {
@@ -929,14 +946,13 @@ export async function verifyEmail({
 }
 
 export async function resendEmailCode({
-  serviceUrl,
+  serviceConfig,
   userId,
   urlTemplate,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   userId: string;
   urlTemplate: string;
-}) {
+}>) {
   let request: ResendEmailCodeRequest = create(ResendEmailCodeRequestSchema, {
     userId,
   });
@@ -947,33 +963,42 @@ export async function resendEmailCode({
 
   request = { ...request, verification: { case: "sendCode", value: medium } };
 
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.resendEmailCode(request, {});
 }
 
-export async function retrieveIDPIntent({ serviceUrl, id, token }: { serviceUrl: string; id: string; token: string }) {
+export async function retrieveIDPIntent({
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  serviceConfig,
+  id,
+  token,
+}: WithServiceConfig<{
+  id: string;
+  token: string;
+}>) {
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.retrieveIdentityProviderIntent({ idpIntentId: id, idpIntentToken: token }, {});
 }
 
-export async function getIDPByID({ serviceUrl, id }: { serviceUrl: string; id: string }) {
+export async function getIDPByID({ serviceConfig, id }: WithServiceConfig<{ id: string }>) {
-  const idpService: Client<typeof IdentityProviderService> = await createServiceForHost(IdentityProviderService, serviceUrl);
+  const idpService: Client<typeof IdentityProviderService> = await createServiceForHost(
+    IdentityProviderService,
+    serviceConfig,
+  );
 
   return idpService.getIDPByID({ id }, {}).then((resp) => resp.idp);
 }
 
 export async function addIDPLink({
-  serviceUrl,
+  serviceConfig,
   idp,
   userId,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   idp: { id: string; userId: string; userName: string };
   userId: string;
-}) {
+}>) {
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.addIDPLink(
     {
@@ -989,14 +1014,13 @@ export async function addIDPLink({
 }
 
 export async function passwordReset({
-  serviceUrl,
+  serviceConfig,
   userId,
   urlTemplate,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   userId: string;
   urlTemplate?: string;
-}) {
+}>) {
   let medium = create(SendPasswordResetLinkSchema, {
     notificationType: NotificationType.Email,
   });
@@ -1006,7 +1030,7 @@ export async function passwordReset({
     urlTemplate,
   };
 
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.passwordReset(
     {
@@ -1021,16 +1045,15 @@ export async function passwordReset({
 }
 
 export async function setUserPassword({
-  serviceUrl,
+  serviceConfig,
   userId,
   password,
   code,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   userId: string;
   password: string;
   code?: string;
-}) {
+}>) {
   let payload = create(SetPasswordRequestSchema, {
     userId,
     newPassword: {
@@ -1048,7 +1071,7 @@ export async function setUserPassword({
     };
   }
 
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.setPassword(payload, {}).catch((error) => {
     // throw error if failed precondition (ex. User is not yet initialized)
@@ -1060,8 +1083,13 @@ export async function setUserPassword({
   });
 }
 
-export async function setPassword({ serviceUrl, payload }: { serviceUrl: string; payload: SetPasswordRequest }) {
+export async function setPassword({
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  serviceConfig,
+  payload,
+}: WithServiceConfig<{
+  payload: SetPasswordRequest;
+}>) {
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.setPassword(payload, {});
 }
@@ -1072,8 +1100,13 @@ export async function setPassword({ serviceUrl, payload }: { serviceUrl: string;
  * @param userId the id of the user where the email should be set
  * @returns the newly set email
  */
-export async function createPasskeyRegistrationLink({ serviceUrl, userId }: { serviceUrl: string; userId: string }) {
+export async function createPasskeyRegistrationLink({
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  serviceConfig,
+  userId,
+}: WithServiceConfig<{
+  userId: string;
+}>) {
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.createPasskeyRegistrationLink({
     userId,
@@ -1091,8 +1124,15 @@ export async function createPasskeyRegistrationLink({ serviceUrl, userId }: { se
  * @param domain the domain on which the factor is registered
  * @returns the newly set email
  */
-export async function registerU2F({ serviceUrl, userId, domain }: { serviceUrl: string; userId: string; domain: string }) {
+export async function registerU2F({
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  serviceConfig,
+  userId,
+  domain,
+}: WithServiceConfig<{
+  userId: string;
+  domain: string;
+}>) {
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.registerU2F({
     userId,
@@ -1107,13 +1147,12 @@ export async function registerU2F({ serviceUrl, userId, domain }: { serviceUrl:
  * @returns the result of the verification
  */
 export async function verifyU2FRegistration({
-  serviceUrl,
+  serviceConfig,
   request,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   request: VerifyU2FRegistrationRequest;
-}) {
+}>) {
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.verifyU2FRegistration(request, {});
 }
@@ -1126,19 +1165,18 @@ export async function verifyU2FRegistration({
  * @returns the active identity providers
  */
 export async function getActiveIdentityProviders({
-  serviceUrl,
+  serviceConfig,
   orgId,
   linking_allowed,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   orgId?: string;
   linking_allowed?: boolean;
-}) {
+}>) {
   const props: any = { ctx: makeReqCtx(orgId) };
   if (linking_allowed) {
     props.linkingAllowed = linking_allowed;
   }
-  const settingsService: Client<typeof SettingsService> = await createServiceForHost(SettingsService, serviceUrl);
+  const settingsService: Client<typeof SettingsService> = await createServiceForHost(SettingsService, serviceConfig);
 
   return settingsService.getActiveIdentityProviders(props, {});
 }
@@ -1150,13 +1188,12 @@ export async function getActiveIdentityProviders({
  * @returns the result of the verification
  */
 export async function verifyPasskeyRegistration({
-  serviceUrl,
+  serviceConfig,
   request,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   request: VerifyPasskeyRegistrationRequest;
-}) {
+}>) {
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.verifyPasskeyRegistration(request, {});
 }
@@ -1170,17 +1207,16 @@ export async function verifyPasskeyRegistration({
  * @returns the newly set email
  */
 export async function registerPasskey({
-  serviceUrl,
+  serviceConfig,
   userId,
   code,
   domain,
-}: {
+}: WithServiceConfig<{
-  serviceUrl: string;
   userId: string;
   code: { id: string; code: string };
   domain: string;
-}) {
+}>) {
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.registerPasskey({
     userId,
@@ -1195,33 +1231,64 @@ export async function registerPasskey({
  * @param userId the id of the user where the email should be set
  * @returns the list of authentication method types
  */
-export async function listAuthenticationMethodTypes({ serviceUrl, userId }: { serviceUrl: string; userId: string }) {
+export async function listAuthenticationMethodTypes({
-  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceUrl);
+  serviceConfig,
+  userId,
+}: WithServiceConfig<{
+  userId: string;
+}>) {
+  const userService: Client<typeof UserService> = await createServiceForHost(UserService, serviceConfig);
 
   return userService.listAuthenticationMethodTypes({
     userId,
   });
 }
 
-export function createServerTransport(token: string, baseUrl: string) {
+export interface ServiceConfig {
+  baseUrl: string;
+  instanceHost?: string; // only for multi-tenant
+  publicHost?: string; // only for multi-tenant
+}
+
+/**
+ * Base type that all function parameters must extend to ensure serviceConfig is always required
+ */
+export type WithServiceConfig<T = {}> = T & {
+  serviceConfig: ServiceConfig;
+};
+
+export function createServerTransport(token: string, serviceConfig: ServiceConfig) {
   return libCreateServerTransport(token, {
-    baseUrl,
+    baseUrl: serviceConfig.baseUrl,
-    interceptors: !process.env.CUSTOM_REQUEST_HEADERS
+    interceptors:
-      ? undefined
+      !process.env.CUSTOM_REQUEST_HEADERS && !serviceConfig.instanceHost && !serviceConfig.publicHost
-      : [
+        ? undefined
-          (next) => {
+        : [
-            return (req) => {
+            (next) => {
-              process.env.CUSTOM_REQUEST_HEADERS!.split(",").forEach((header) => {
+              return (req) => {
-                const kv = header.indexOf(":");
+                // Apply headers from serviceConfig
-                if (kv > 0) {
+                if (serviceConfig.instanceHost) {
-                  req.header.set(header.slice(0, kv).trim(), header.slice(kv + 1).trim());
+                  req.header.set("x-zitadel-instance-host", serviceConfig.instanceHost);
-                } else {
-                  console.warn(`Skipping malformed header: ${header}`);
                 }
-              });
+                if (serviceConfig.publicHost) {
-              return next(req);
+                  req.header.set("x-zitadel-public-host", serviceConfig.publicHost);
-            };
+                }
-          },
+
-        ],
+                // Apply headers from CUSTOM_REQUEST_HEADERS environment variable
+                if (process.env.CUSTOM_REQUEST_HEADERS) {
+                  process.env.CUSTOM_REQUEST_HEADERS.split(",").forEach((header) => {
+                    const kv = header.indexOf(":");
+                    if (kv > 0) {
+                      req.header.set(header.slice(0, kv).trim(), header.slice(kv + 1).trim());
+                    } else {
+                      console.warn(`Skipping malformed header: ${header}`);
+                    }
+                  });
+                }
+
+                return next(req);
+              };
+            },
+          ],
   });
 }

apps/login/src/middleware.ts

@@ -3,28 +3,16 @@ import { SecuritySettings } from "@zitadel/proto/zitadel/settings/v2/security_se
 import { headers } from "next/headers";
 import { NextRequest, NextResponse } from "next/server";
 import { DEFAULT_CSP } from "../constants/csp";
-import { getServiceUrlFromHeaders } from "./lib/service-url";
+import { getServiceConfig } from "./lib/service-url";
 export const config = {
-  matcher: [
+  matcher: ["/.well-known/:path*", "/oauth/:path*", "/oidc/:path*", "/idps/callback/:path*", "/saml/:path*", "/:path*"],
-    "/.well-known/:path*",
-    "/oauth/:path*",
-    "/oidc/:path*",
-    "/idps/callback/:path*",
-    "/saml/:path*",
-    "/:path*",
-  ],
 };
 
-async function loadSecuritySettings(
+async function loadSecuritySettings(request: NextRequest): Promise<SecuritySettings | null> {
-  request: NextRequest,
-): Promise<SecuritySettings | null> {
   const securityResponse = await fetch(`${request.nextUrl.origin}/security`);
 
   if (!securityResponse.ok) {
-    console.error(
+    console.error("Failed to fetch security settings:", securityResponse.statusText);
-      "Failed to fetch security settings:",
-      securityResponse.statusText,
-    );
     return null;
   }
 
@@ -49,40 +37,28 @@ export async function middleware(request: NextRequest) {
   }
 
   // Only run the rest of the logic for the original matcher paths
-  const proxyPaths = [
+  const proxyPaths = ["/.well-known/", "/oauth/", "/oidc/", "/idps/callback/", "/saml/"];
-    "/.well-known/",
-    "/oauth/",
-    "/oidc/",
-    "/idps/callback/",
-    "/saml/",
-  ];
 
-  const isMatched = proxyPaths.some((prefix) =>
+  const isMatched = proxyPaths.some((prefix) => request.nextUrl.pathname.startsWith(prefix));
-    request.nextUrl.pathname.startsWith(prefix),
-  );
 
-  // escape proxy if the environment is setup for multitenancy
+  // Only proxy in self-hosted mode
-  if (
+  if (!isMatched) {
-    !isMatched ||
+    // For multi-tenant or non-proxied routes, just add the header and continue
-    !process.env.ZITADEL_API_URL ||
-    !process.env.ZITADEL_SERVICE_USER_TOKEN
-  ) {
-    // For all other routes, just add the header and continue
     return NextResponse.next({
       request: { headers: requestHeaders },
     });
   }
 
   const _headers = await headers();
-  const { serviceUrl } = getServiceUrlFromHeaders(_headers);
+  const { serviceConfig } = getServiceConfig(_headers);
 
-  const instanceHost = `${serviceUrl}`
+  // add additional headers if available
-    .replace("https://", "")
+  if (serviceConfig.publicHost) {
-    .replace("http://", "");
+    requestHeaders.set("x-zitadel-public-host", serviceConfig.publicHost);
-
+  }
-  // Add additional headers as before
+  if (serviceConfig.instanceHost) {
-  requestHeaders.set("x-zitadel-public-host", `${request.nextUrl.host}`);
+    requestHeaders.set("x-zitadel-instance-host", serviceConfig.instanceHost);
-  requestHeaders.set("x-zitadel-instance-host", instanceHost);
+  }
 
   const responseHeaders = new Headers();
   responseHeaders.set("Access-Control-Allow-Origin", "*");
@@ -98,7 +74,7 @@ export async function middleware(request: NextRequest) {
     responseHeaders.delete("X-Frame-Options");
   }
 
-  request.nextUrl.href = `${serviceUrl}${request.nextUrl.pathname}${request.nextUrl.search}`;
+  request.nextUrl.href = `${serviceConfig.baseUrl}${request.nextUrl.pathname}${request.nextUrl.search}`;
 
   return NextResponse.rewrite(request.nextUrl, {
     request: {

apps/login/tsconfig.json

@@ -28,6 +28,16 @@
       ]
     }
   },
-  "include": ["next-env.d.ts", "**/*.ts", "**/*.tsx", ".next/types/**/*.ts"],
+  "include": [
-  "exclude": ["node_modules", "integration", "acceptance"]
+    "next-env.d.ts",
+    "**/*.ts",
+    "**/*.tsx",
+    ".next/types/**/*.ts",
+    ".next/dev/types/**/*.ts"
+  ],
+  "exclude": [
+    "node_modules",
+    "integration",
+    "acceptance"
+  ]
 }

internal/api/oidc/auth_request.go

@@ -10,10 +10,11 @@ import (
 	"strings"
 	"time"
 
+	"github.com/go-jose/go-jose/v4"
 	"github.com/zitadel/logging"
+	"github.com/zitadel/oidc/v3/pkg/crypto"
 	"github.com/zitadel/oidc/v3/pkg/oidc"
 	"github.com/zitadel/oidc/v3/pkg/op"
-	"golang.org/x/text/language"
 
 	"github.com/zitadel/zitadel/internal/api/authz"
 	http_utils "github.com/zitadel/zitadel/internal/api/http"
@@ -33,6 +34,7 @@ const (
 	LoginPostLogoutRedirectParam = "post_logout_redirect"
 	LoginLogoutHintParam         = "logout_hint"
 	LoginUILocalesParam          = "ui_locales"
+	LoginLogoutTokenParam        = "logout_token"
 	LoginPath                    = "/login"
 	LogoutPath                   = "/logout"
 	LogoutDonePath               = "/logout/done"
@@ -298,7 +300,11 @@ func (o *OPStorage) TerminateSessionFromRequest(ctx context.Context, endSessionR
 		} else {
 			logoutURI = logoutURI.JoinPath(LogoutPath)
 		}
-		return buildLoginV2LogoutURL(logoutURI, redirectURI, endSessionRequest.LogoutHint, endSessionRequest.UILocales), nil
+		signer, _, err := GetSignerOnce(o.query.GetActiveSigningWebKey)(ctx)
+		if err != nil {
+			return "", err
+		}
+		return buildLoginV2LogoutURL(logoutURI, redirectURI, endSessionRequest.LogoutHint, endSessionRequest.UILocales, signer)
 	}
 
 	// V1:
@@ -375,7 +381,13 @@ func (o *OPStorage) federatedLogout(ctx context.Context, sessionID string, postL
 	return login.ExternalLogoutPath(sessionID)
 }
 
-func buildLoginV2LogoutURL(logoutURI *url.URL, redirectURI, logoutHint string, uiLocales []language.Tag) string {
+type logoutTokenPayload struct {
+	PostLogoutRedirectURI string       `json:"post_logout_redirect_uri,omitempty"`
+	LogoutHint            string       `json:"logout_hint,omitempty"`
+	UILocales             oidc.Locales `json:"ui_locales,omitempty"`
+}
+
+func buildLoginV2LogoutURL(logoutURI *url.URL, redirectURI, logoutHint string, uiLocales oidc.Locales, signer jose.Signer) (string, error) {
 	if strings.HasSuffix(logoutURI.Path, "/") && len(logoutURI.Path) > 1 {
 		logoutURI.Path = strings.TrimSuffix(logoutURI.Path, "/")
 	}
@@ -386,14 +398,19 @@ func buildLoginV2LogoutURL(logoutURI *url.URL, redirectURI, logoutHint string, u
 		q.Set(LoginLogoutHintParam, logoutHint)
 	}
 	if len(uiLocales) > 0 {
-		locales := make([]string, len(uiLocales))
+		q.Set(LoginUILocalesParam, uiLocales.String())
-		for i, locale := range uiLocales {
-			locales[i] = locale.String()
-		}
-		q.Set(LoginUILocalesParam, strings.Join(locales, " "))
 	}
+	logoutToken, err := crypto.Sign(&logoutTokenPayload{
+		PostLogoutRedirectURI: redirectURI,
+		LogoutHint:            logoutHint,
+		UILocales:             uiLocales,
+	}, signer)
+	if err != nil {
+		return "", err
+	}
+	q.Set(LoginLogoutTokenParam, logoutToken)
 	logoutURI.RawQuery = q.Encode()
-	return logoutURI.String()
+	return logoutURI.String(), nil
 }
 
 // v2PostLogoutRedirectURI will take care that the post_logout_redirect_uri is correctly set for v2 logins.

internal/api/oidc/auth_request_test.go

@@ -1,9 +1,13 @@
 package oidc
 
 import (
+	"crypto/rand"
+	"crypto/rsa"
+	"encoding/json"
 	"net/url"
 	"testing"
 
+	"github.com/go-jose/go-jose/v4"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"golang.org/x/text/language"
@@ -18,6 +22,7 @@ func TestBuildLoginV2LogoutURL(t *testing.T) {
 		redirectURI    string
 		logoutHint     string
 		uiLocales      []language.Tag
+		signer         jose.Signer
 		expectedParams map[string]string
 	}{
 		{
@@ -26,6 +31,7 @@ func TestBuildLoginV2LogoutURL(t *testing.T) {
 			redirectURI:  "https://client/cb",
 			expectedParams: map[string]string{
 				"post_logout_redirect": "https://client/cb",
+				"logout_token":         "", // presence checked separately
 			},
 		},
 		{
@@ -36,6 +42,7 @@ func TestBuildLoginV2LogoutURL(t *testing.T) {
 			expectedParams: map[string]string{
 				"post_logout_redirect": "https://client/cb",
 				"logout_hint":          "[email protected]",
+				"logout_token":         "", // presence checked separately
 			},
 		},
 		{
@@ -46,6 +53,7 @@ func TestBuildLoginV2LogoutURL(t *testing.T) {
 			expectedParams: map[string]string{
 				"post_logout_redirect": "https://client/cb",
 				"ui_locales":           "en it",
+				"logout_token":         "", // presence checked separately
 			},
 		},
 		{
@@ -58,6 +66,7 @@ func TestBuildLoginV2LogoutURL(t *testing.T) {
 				"post_logout_redirect": "https://client/cb",
 				"logout_hint":          "logoutme",
 				"ui_locales":           "de-CH fr",
+				"logout_token":         "", // presence checked separately
 			},
 		},
 		{
@@ -66,6 +75,7 @@ func TestBuildLoginV2LogoutURL(t *testing.T) {
 			redirectURI:  "https://client/cb",
 			expectedParams: map[string]string{
 				"post_logout_redirect": "https://client/cb",
+				"logout_token":         "", // presence checked separately
 			},
 		},
 	}
@@ -79,9 +89,10 @@ func TestBuildLoginV2LogoutURL(t *testing.T) {
 			require.NoError(t, err)
 
 			// When
-			got := buildLoginV2LogoutURL(logoutURI, tc.redirectURI, tc.logoutHint, tc.uiLocales)
+			got, err := buildLoginV2LogoutURL(logoutURI, tc.redirectURI, tc.logoutHint, tc.uiLocales, signer)
 
 			// Then
+			require.NoError(t, err)
 			gotURL, err := url.Parse(got)
 			require.NoError(t, err)
 			require.NotContains(t, gotURL.String(), "/logout/")
@@ -91,8 +102,39 @@ func TestBuildLoginV2LogoutURL(t *testing.T) {
 			require.Len(t, q, len(tc.expectedParams))
 
 			for k, v := range tc.expectedParams {
+				if k == LoginLogoutTokenParam {
+					assertLogoutToken(t, q.Get(k), &logoutTokenPayload{
+						PostLogoutRedirectURI: tc.redirectURI,
+						LogoutHint:            tc.logoutHint,
+						UILocales:             tc.uiLocales,
+					})
+					continue
+				}
 				assert.Equal(t, v, q.Get(k))
 			}
 		})
 	}
 }
+
+func assertLogoutToken(t *testing.T, token string, payload *logoutTokenPayload) {
+	signature, err := jose.ParseSigned(token, []jose.SignatureAlgorithm{jose.RS256})
+	require.NoError(t, err)
+	logoutToken := new(logoutTokenPayload)
+	err = json.Unmarshal(signature.UnsafePayloadWithoutVerification(), logoutToken)
+	require.NoError(t, err)
+	assert.Equal(t, payload, logoutToken)
+}
+
+var (
+	privKey, _ = rsa.GenerateKey(rand.Reader, 2048)
+	signer     = func() jose.Signer {
+		signer, _ := jose.NewSigner(
+			jose.SigningKey{
+				Algorithm: jose.RS256,
+				Key:       privKey,
+			},
+			(&jose.SignerOptions{}).WithType("JWT"),
+		)
+		return signer
+	}()
+)

internal/api/oidc/integration_test/auth_request_test.go

@@ -551,15 +551,16 @@ func TestOPStorage_TerminateSession_refresh_grant(t *testing.T) {
 	require.NoError(t, err)
 }
 
-func buildLogoutURL(origin, logoutURLV2 string, redirectURI string, extraParams map[string]string) string {
+func buildLogoutURL(origin, logoutURLV2, redirectURI string, extraParams map[string]string) *url.URL {
 	u, _ := url.Parse(origin + logoutURLV2 + redirectURI)
 	q := u.Query()
 	for k, v := range extraParams {
 		q.Set(k, v)
 	}
+	q.Set("logout_token", "signed-logout-token") // placeholder
 	u.RawQuery = q.Encode()
 	// Append the redirect URI as a URL-escaped string
-	return u.String()
+	return u
 }
 
 func TestOPStorage_TerminateSession_empty_id_token_hint(t *testing.T) {
@@ -567,7 +568,7 @@ func TestOPStorage_TerminateSession_empty_id_token_hint(t *testing.T) {
 		name          string
 		clientID      string
 		authRequestID func(t testing.TB, instance *integration.Instance, clientID, redirectURI string, scope ...string) string
-		logoutURL     string
+		logoutURL     *url.URL
 	}{
 		{
 			name: "login header",
@@ -614,7 +615,18 @@ func TestOPStorage_TerminateSession_empty_id_token_hint(t *testing.T) {
 
 			postLogoutRedirect, err := rp.EndSession(CTX, provider, "", logoutRedirectURI, "state", "hint", oidc.ParseLocales([]string{"it-IT", "en-US"}))
 			require.NoError(t, err)
-			assert.Equal(t, tt.logoutURL, postLogoutRedirect.String())
+
+			requiredQueries := tt.logoutURL.Query()
+			for key, value := range requiredQueries {
+				if key == "logout_token" {
+					assert.NotEmpty(t, value[0], "logout_token must be present")
+					continue
+				}
+				assert.Equal(t, value[0], postLogoutRedirect.Query().Get(key))
+			}
+			requiredURLWithoutQueries := *tt.logoutURL
+			requiredURLWithoutQueries.RawQuery = ""
+			assert.Equal(t, requiredURLWithoutQueries.String(), postLogoutRedirect.Scheme+"://"+postLogoutRedirect.Host+postLogoutRedirect.Path)
 
 			// userinfo must not fail until login UI terminated session
 			_, err = rp.Userinfo[*oidc.UserInfo](CTX, tokens.AccessToken, tokens.TokenType, tokens.IDTokenClaims.Subject, provider)

packages/zitadel-client/src/node.ts

@@ -1,5 +1,14 @@
-import { createGrpcTransport, GrpcTransportOptions } from "@connectrpc/connect-node";
+import {
-import { importPKCS8, SignJWT } from "jose";
+  createGrpcTransport,
+  GrpcTransportOptions,
+} from "@connectrpc/connect-node";
+import {
+  createRemoteJWKSet,
+  importPKCS8,
+  jwtVerify,
+  JWTPayload,
+  SignJWT,
+} from "jose";
 import { NewAuthorizationBearerInterceptor } from "./interceptors.js";
 
 /**
@@ -7,10 +16,16 @@ import { NewAuthorizationBearerInterceptor } from "./interceptors.js";
  * @param token
  * @param opts
  */
-export function createServerTransport(token: string, opts: GrpcTransportOptions) {
+export function createServerTransport(
+  token: string,
+  opts: GrpcTransportOptions
+) {
   return createGrpcTransport({
     ...opts,
-    interceptors: [...(opts.interceptors || []), NewAuthorizationBearerInterceptor(token)],
+    interceptors: [
+      ...(opts.interceptors || []),
+      NewAuthorizationBearerInterceptor(token),
+    ],
   });
 }
 
@@ -34,3 +49,36 @@ export async function newSystemToken({
     .setAudience(audience)
     .sign(await importPKCS8(key, "RS256"));
 }
+
+/**
+ * Verify a signed JWT with the given keys endpoint.
+ * @param token
+ * @param keysEndpoint
+ * @param options
+ */
+export async function verifyJwt<T = JWTPayload>(
+  token: string,
+  keysEndpoint: string,
+  options?: {
+    issuer?: string;
+    audience?: string;
+    instanceHost?: string;
+    publicHost?: string;
+  },
+): Promise<T & JWTPayload> {
+   const headers: Record<string, string> = {};
+   if (options?.instanceHost) {
+     headers["x-zitadel-instance-host"] = options.instanceHost;
+   }
+   if (options?.publicHost) {
+     headers["x-zitadel-public-host"] = options.publicHost;
+   }
+  const JWKS = createRemoteJWKSet(new URL(keysEndpoint), {headers: headers});
+
+  const { payload } = await jwtVerify(token, JWKS, {
+    issuer: options?.issuer,
+    audience: options?.audience,
+  });
+
+  return payload as T & JWTPayload;
+}